RHEL 4.5 guest virtual network performace
Hi guys, I have the following configuration: 1. host is RHEL 5.5, 64bit with KVM (version that comes out of the box with RHEL 5.5) 2. two guests: 2a: RHEL 5.5, 32bit, 2b: RHEL 4.5, 64bit If I run iperf between host RHEL 5.5 and guest RHEL 5.5 inside the virtual network subnet I get great results ( 4Gbit/sec). But if I run iperf between guest RHEL 4.5 and either of the two RHELs 5.5 I get bad network performance (around 140Mbit/sec). The configuration was made thru virtual-manager utility, nothing special. I just added virtual network device to both guests. Could you guys give me some tips on what should I check? Regards, Alex -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: RHEL 4.5 guest virtual network performace
On 08/16/2010 10:00 PM, Alex Rixhardson wrote: Hi guys, I have the following configuration: 1. host is RHEL 5.5, 64bit with KVM (version that comes out of the box with RHEL 5.5) 2. two guests: 2a: RHEL 5.5, 32bit, 2b: RHEL 4.5, 64bit If I run iperf between host RHEL 5.5 and guest RHEL 5.5 inside the virtual network subnet I get great results ( 4Gbit/sec). But if I run iperf between guest RHEL 4.5 and either of the two RHELs 5.5 I get bad network performance (around 140Mbit/sec). Please try netperf, iperf known to be buggy and might consume cpu w/o real justification The configuration was made thru virtual-manager utility, nothing special. I just added virtual network device to both guests. Could you guys give me some tips on what should I check? Regards, Alex -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: RHEL 4.5 guest virtual network performace
Thanks for the suggestion. I tried with the netperf. I ran netserver on host and netperf on RHEL 5.5 and RHEL 4.5 guests. This are the results of 60 seconds long tests: RHEL 4.5 guest: Throughput (10^6bits/sec) = 145.80 RHEL 5.5 guest: Throughput (10^6bits/sec) = 3760.24 The results are really bad on RHEL 4.5 guest. What could be wrong? Regards, Alex On Mon, Aug 16, 2010 at 9:49 PM, Dor Laor dl...@redhat.com wrote: On 08/16/2010 10:00 PM, Alex Rixhardson wrote: Hi guys, I have the following configuration: 1. host is RHEL 5.5, 64bit with KVM (version that comes out of the box with RHEL 5.5) 2. two guests: 2a: RHEL 5.5, 32bit, 2b: RHEL 4.5, 64bit If I run iperf between host RHEL 5.5 and guest RHEL 5.5 inside the virtual network subnet I get great results ( 4Gbit/sec). But if I run iperf between guest RHEL 4.5 and either of the two RHELs 5.5 I get bad network performance (around 140Mbit/sec). Please try netperf, iperf known to be buggy and might consume cpu w/o real justification The configuration was made thru virtual-manager utility, nothing special. I just added virtual network device to both guests. Could you guys give me some tips on what should I check? Regards, Alex -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: RHEL 4.5 guest virtual network performace
On 08/17/2010 12:22 AM, Alex Rixhardson wrote: Thanks for the suggestion. I tried with the netperf. I ran netserver on host and netperf on RHEL 5.5 and RHEL 4.5 guests. This are the results of 60 seconds long tests: RHEL 4.5 guest: Throughput (10^6bits/sec) = 145.80 At least it bought you another 5Mb/s over iperf ... It might be time related, 5.5 has kvmclock but rhel4 does not. If it's 64 bit guest add this to the 4.5 guest cmdline 'notsc divider=10'. If it's 32 use 'clock=pmtmr divider=10'. The divider is probably new and is in rhel4.8 only, it's ok w/o it too. What's the host load for the 4.5 guest? RHEL 5.5 guest: Throughput (10^6bits/sec) = 3760.24 The results are really bad on RHEL 4.5 guest. What could be wrong? Regards, Alex On Mon, Aug 16, 2010 at 9:49 PM, Dor Laordl...@redhat.com wrote: On 08/16/2010 10:00 PM, Alex Rixhardson wrote: Hi guys, I have the following configuration: 1. host is RHEL 5.5, 64bit with KVM (version that comes out of the box with RHEL 5.5) 2. two guests: 2a: RHEL 5.5, 32bit, 2b: RHEL 4.5, 64bit If I run iperf between host RHEL 5.5 and guest RHEL 5.5 inside the virtual network subnet I get great results (4Gbit/sec). But if I run iperf between guest RHEL 4.5 and either of the two RHELs 5.5 I get bad network performance (around 140Mbit/sec). Please try netperf, iperf known to be buggy and might consume cpu w/o real justification The configuration was made thru virtual-manager utility, nothing special. I just added virtual network device to both guests. Could you guys give me some tips on what should I check? Regards, Alex -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: RHEL 4.5 guest virtual network performace
I tried with 'notsc divider=10' (since it's 64 bit guest), but the results are the still same :-(. The guest is idle at the time of testing. It has 2 CPU and 1024 MB RAM available. On Mon, Aug 16, 2010 at 11:35 PM, Dor Laor dl...@redhat.com wrote: On 08/17/2010 12:22 AM, Alex Rixhardson wrote: Thanks for the suggestion. I tried with the netperf. I ran netserver on host and netperf on RHEL 5.5 and RHEL 4.5 guests. This are the results of 60 seconds long tests: RHEL 4.5 guest: Throughput (10^6bits/sec) = 145.80 At least it bought you another 5Mb/s over iperf ... It might be time related, 5.5 has kvmclock but rhel4 does not. If it's 64 bit guest add this to the 4.5 guest cmdline 'notsc divider=10'. If it's 32 use 'clock=pmtmr divider=10'. The divider is probably new and is in rhel4.8 only, it's ok w/o it too. What's the host load for the 4.5 guest? RHEL 5.5 guest: Throughput (10^6bits/sec) = 3760.24 The results are really bad on RHEL 4.5 guest. What could be wrong? Regards, Alex On Mon, Aug 16, 2010 at 9:49 PM, Dor Laordl...@redhat.com wrote: On 08/16/2010 10:00 PM, Alex Rixhardson wrote: Hi guys, I have the following configuration: 1. host is RHEL 5.5, 64bit with KVM (version that comes out of the box with RHEL 5.5) 2. two guests: 2a: RHEL 5.5, 32bit, 2b: RHEL 4.5, 64bit If I run iperf between host RHEL 5.5 and guest RHEL 5.5 inside the virtual network subnet I get great results ( 4Gbit/sec). But if I run iperf between guest RHEL 4.5 and either of the two RHELs 5.5 I get bad network performance (around 140Mbit/sec). Please try netperf, iperf known to be buggy and might consume cpu w/o real justification The configuration was made thru virtual-manager utility, nothing special. I just added virtual network device to both guests. Could you guys give me some tips on what should I check? Regards, Alex -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: RHEL 4.5 guest virtual network performace
On 08/17/2010 12:51 AM, Alex Rixhardson wrote: I tried with 'notsc divider=10' (since it's 64 bit guest), but the results are the still same :-(. The guest is idle at the time of testing. It has 2 CPU and 1024 MB RAM available. Hmm, are you using e1000 or virtio for the 4.5 guest? e1000 should be slow since it's less suitable for virtualization (3 mmio/packet) On Mon, Aug 16, 2010 at 11:35 PM, Dor Laordl...@redhat.com wrote: On 08/17/2010 12:22 AM, Alex Rixhardson wrote: Thanks for the suggestion. I tried with the netperf. I ran netserver on host and netperf on RHEL 5.5 and RHEL 4.5 guests. This are the results of 60 seconds long tests: RHEL 4.5 guest: Throughput (10^6bits/sec) = 145.80 At least it bought you another 5Mb/s over iperf ... It might be time related, 5.5 has kvmclock but rhel4 does not. If it's 64 bit guest add this to the 4.5 guest cmdline 'notsc divider=10'. If it's 32 use 'clock=pmtmr divider=10'. The divider is probably new and is in rhel4.8 only, it's ok w/o it too. What's the host load for the 4.5 guest? RHEL 5.5 guest: Throughput (10^6bits/sec) = 3760.24 The results are really bad on RHEL 4.5 guest. What could be wrong? Regards, Alex On Mon, Aug 16, 2010 at 9:49 PM, Dor Laordl...@redhat.comwrote: On 08/16/2010 10:00 PM, Alex Rixhardson wrote: Hi guys, I have the following configuration: 1. host is RHEL 5.5, 64bit with KVM (version that comes out of the box with RHEL 5.5) 2. two guests: 2a: RHEL 5.5, 32bit, 2b: RHEL 4.5, 64bit If I run iperf between host RHEL 5.5 and guest RHEL 5.5 inside the virtual network subnet I get great results ( 4Gbit/sec). But if I run iperf between guest RHEL 4.5 and either of the two RHELs 5.5 I get bad network performance (around 140Mbit/sec). Please try netperf, iperf known to be buggy and might consume cpu w/o real justification The configuration was made thru virtual-manager utility, nothing special. I just added virtual network device to both guests. Could you guys give me some tips on what should I check? Regards, Alex -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: RHEL 4.5 guest virtual network performace
virtio...I think :-). How could I confirm that? Regards, Alex On Mon, Aug 16, 2010 at 11:56 PM, Dor Laor dl...@redhat.com wrote: On 08/17/2010 12:51 AM, Alex Rixhardson wrote: I tried with 'notsc divider=10' (since it's 64 bit guest), but the results are the still same :-(. The guest is idle at the time of testing. It has 2 CPU and 1024 MB RAM available. Hmm, are you using e1000 or virtio for the 4.5 guest? e1000 should be slow since it's less suitable for virtualization (3 mmio/packet) On Mon, Aug 16, 2010 at 11:35 PM, Dor Laordl...@redhat.com wrote: On 08/17/2010 12:22 AM, Alex Rixhardson wrote: Thanks for the suggestion. I tried with the netperf. I ran netserver on host and netperf on RHEL 5.5 and RHEL 4.5 guests. This are the results of 60 seconds long tests: RHEL 4.5 guest: Throughput (10^6bits/sec) = 145.80 At least it bought you another 5Mb/s over iperf ... It might be time related, 5.5 has kvmclock but rhel4 does not. If it's 64 bit guest add this to the 4.5 guest cmdline 'notsc divider=10'. If it's 32 use 'clock=pmtmr divider=10'. The divider is probably new and is in rhel4.8 only, it's ok w/o it too. What's the host load for the 4.5 guest? RHEL 5.5 guest: Throughput (10^6bits/sec) = 3760.24 The results are really bad on RHEL 4.5 guest. What could be wrong? Regards, Alex On Mon, Aug 16, 2010 at 9:49 PM, Dor Laordl...@redhat.com wrote: On 08/16/2010 10:00 PM, Alex Rixhardson wrote: Hi guys, I have the following configuration: 1. host is RHEL 5.5, 64bit with KVM (version that comes out of the box with RHEL 5.5) 2. two guests: 2a: RHEL 5.5, 32bit, 2b: RHEL 4.5, 64bit If I run iperf between host RHEL 5.5 and guest RHEL 5.5 inside the virtual network subnet I get great results ( 4Gbit/sec). But if I run iperf between guest RHEL 4.5 and either of the two RHELs 5.5 I get bad network performance (around 140Mbit/sec). Please try netperf, iperf known to be buggy and might consume cpu w/o real justification The configuration was made thru virtual-manager utility, nothing special. I just added virtual network device to both guests. Could you guys give me some tips on what should I check? Regards, Alex -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: RHEL 4.5 guest virtual network performace
Thank you a lot for the tip - you were right. The 5.5 guest is using virtio, but 4.5 is not. So, this is the reason. Adding model type='virtio' / to the config file unfortunately doesn't help - the network card is not recognized by the guest. Do I need to install something extra on the guest RHEL 4.5? Regards, Alex On Tue, Aug 17, 2010 at 12:05 AM, Alex Rixhardson alexrixhard...@gmail.com wrote: virtio...I think :-). How could I confirm that? Regards, Alex On Mon, Aug 16, 2010 at 11:56 PM, Dor Laor dl...@redhat.com wrote: On 08/17/2010 12:51 AM, Alex Rixhardson wrote: I tried with 'notsc divider=10' (since it's 64 bit guest), but the results are the still same :-(. The guest is idle at the time of testing. It has 2 CPU and 1024 MB RAM available. Hmm, are you using e1000 or virtio for the 4.5 guest? e1000 should be slow since it's less suitable for virtualization (3 mmio/packet) On Mon, Aug 16, 2010 at 11:35 PM, Dor Laordl...@redhat.com wrote: On 08/17/2010 12:22 AM, Alex Rixhardson wrote: Thanks for the suggestion. I tried with the netperf. I ran netserver on host and netperf on RHEL 5.5 and RHEL 4.5 guests. This are the results of 60 seconds long tests: RHEL 4.5 guest: Throughput (10^6bits/sec) = 145.80 At least it bought you another 5Mb/s over iperf ... It might be time related, 5.5 has kvmclock but rhel4 does not. If it's 64 bit guest add this to the 4.5 guest cmdline 'notsc divider=10'. If it's 32 use 'clock=pmtmr divider=10'. The divider is probably new and is in rhel4.8 only, it's ok w/o it too. What's the host load for the 4.5 guest? RHEL 5.5 guest: Throughput (10^6bits/sec) = 3760.24 The results are really bad on RHEL 4.5 guest. What could be wrong? Regards, Alex On Mon, Aug 16, 2010 at 9:49 PM, Dor Laordl...@redhat.com wrote: On 08/16/2010 10:00 PM, Alex Rixhardson wrote: Hi guys, I have the following configuration: 1. host is RHEL 5.5, 64bit with KVM (version that comes out of the box with RHEL 5.5) 2. two guests: 2a: RHEL 5.5, 32bit, 2b: RHEL 4.5, 64bit If I run iperf between host RHEL 5.5 and guest RHEL 5.5 inside the virtual network subnet I get great results ( 4Gbit/sec). But if I run iperf between guest RHEL 4.5 and either of the two RHELs 5.5 I get bad network performance (around 140Mbit/sec). Please try netperf, iperf known to be buggy and might consume cpu w/o real justification The configuration was made thru virtual-manager utility, nothing special. I just added virtual network device to both guests. Could you guys give me some tips on what should I check? Regards, Alex -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: RHEL 4.5 guest virtual network performace
On 08/16/10 17:09, Alex Rixhardson wrote: Thank you a lot for the tip - you were right. The 5.5 guest is using virtio, but 4.5 is not. So, this is the reason. Adding model type='virtio' / to the config file unfortunately doesn't help - the network card is not recognized by the guest. Do I need to install something extra on the guest RHEL 4.5? RHEL4.8 is the first RHEL4 version to support virtio devices. David Regards, Alex On Tue, Aug 17, 2010 at 12:05 AM, Alex Rixhardson alexrixhard...@gmail.com wrote: virtio...I think :-). How could I confirm that? Regards, Alex On Mon, Aug 16, 2010 at 11:56 PM, Dor Laor dl...@redhat.com wrote: On 08/17/2010 12:51 AM, Alex Rixhardson wrote: I tried with 'notsc divider=10' (since it's 64 bit guest), but the results are the still same :-(. The guest is idle at the time of testing. It has 2 CPU and 1024 MB RAM available. Hmm, are you using e1000 or virtio for the 4.5 guest? e1000 should be slow since it's less suitable for virtualization (3 mmio/packet) On Mon, Aug 16, 2010 at 11:35 PM, Dor Laordl...@redhat.com wrote: On 08/17/2010 12:22 AM, Alex Rixhardson wrote: Thanks for the suggestion. I tried with the netperf. I ran netserver on host and netperf on RHEL 5.5 and RHEL 4.5 guests. This are the results of 60 seconds long tests: RHEL 4.5 guest: Throughput (10^6bits/sec) = 145.80 At least it bought you another 5Mb/s over iperf ... It might be time related, 5.5 has kvmclock but rhel4 does not. If it's 64 bit guest add this to the 4.5 guest cmdline 'notsc divider=10'. If it's 32 use 'clock=pmtmr divider=10'. The divider is probably new and is in rhel4.8 only, it's ok w/o it too. What's the host load for the 4.5 guest? RHEL 5.5 guest: Throughput (10^6bits/sec) = 3760.24 The results are really bad on RHEL 4.5 guest. What could be wrong? Regards, Alex On Mon, Aug 16, 2010 at 9:49 PM, Dor Laordl...@redhat.comwrote: On 08/16/2010 10:00 PM, Alex Rixhardson wrote: Hi guys, I have the following configuration: 1. host is RHEL 5.5, 64bit with KVM (version that comes out of the box with RHEL 5.5) 2. two guests: 2a: RHEL 5.5, 32bit, 2b: RHEL 4.5, 64bit If I run iperf between host RHEL 5.5 and guest RHEL 5.5 inside the virtual network subnet I get great results ( 4Gbit/sec). But if I run iperf between guest RHEL 4.5 and either of the two RHELs 5.5 I get bad network performance (around 140Mbit/sec). Please try netperf, iperf known to be buggy and might consume cpu w/o real justification The configuration was made thru virtual-manager utility, nothing special. I just added virtual network device to both guests. Could you guys give me some tips on what should I check? Regards, Alex -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
