Re: Network Speed issues on Fedora 12
alan wrote: I have a couple of systems with gigabit ethernet cards. If I copy a large quantity of data to the machine I notice the data throughput start to fall off after about 4-5 gigs. It keeps getting slower and slower the more data that flows through the interface. Try running iostat -k -x 1 on the machine during the entire test. Have a look at the utilization rate of the disk (is it 100% or not?), throughput in KiB/s, the CPU usage (system? user? waiting? idle?), RAM used for caching (you need a vmstat 1 in parallel for this). -- Roberto Ragusamail at robertoragusa.it -- users mailing list users@lists.fedoraproject.org To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
Re: Network Speed issues on Fedora 12
alan wrote: I have a couple of systems with gigabit ethernet cards. If I copy a large quantity of data to the machine I notice the data throughput start to fall off after about 4-5 gigs. It keeps getting slower and slower the more data that flows through the interface. And drops to the sustained write speed of your drive(s) you're writing. This happens on x86_64 and i386. A similar Ubuntu system does not show the problem. Are you using LVM on one system or the other? If I run the Fedora 12 system under VMWare, I still see the problem. Windows Server 2008 runs fine on the same VMWare server. Any ideas here? This has been driving me mad and I have seen nothing useful on this issue in my various Google searches. Thanks! -- Bill Davidsen david...@tmr.com We have more to fear from the bungling of the incompetent than from the machinations of the wicked. - from Slashdot -- users mailing list users@lists.fedoraproject.org To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
Re: Network Speed issues on Fedora 12
On Thu, 2010-06-03 at 19:42 -0700, alan wrote: I have a couple of systems with gigabit ethernet cards. If I copy a large quantity of data to the machine I notice the data throughput start to fall off after about 4-5 gigs. It keeps getting slower and slower the more data that flows through the interface. This happens on x86_64 and i386. A similar Ubuntu system does not show the problem. If I run the Fedora 12 system under VMWare, I still see the problem. Windows Server 2008 runs fine on the same VMWare server. Any ideas here? This has been driving me mad and I have seen nothing useful on this issue in my various Google searches. Thanks! You'll need to post far more information. From where to where do you transfer files? host to host? guest to host? guest to guest? Using which protocol? NFS? SMB? FTP? What type of hardware is being used on the hosts? What type of hardware is being used on the guests? What type of -software- is being used on the hosts? etc, etc, etc. - Gilboa -- users mailing list users@lists.fedoraproject.org To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
Network Speed issues on Fedora 12
I have a couple of systems with gigabit ethernet cards. If I copy a large quantity of data to the machine I notice the data throughput start to fall off after about 4-5 gigs. It keeps getting slower and slower the more data that flows through the interface. This happens on x86_64 and i386. A similar Ubuntu system does not show the problem. If I run the Fedora 12 system under VMWare, I still see the problem. Windows Server 2008 runs fine on the same VMWare server. Any ideas here? This has been driving me mad and I have seen nothing useful on this issue in my various Google searches. Thanks! -- Truth is stranger than fiction because fiction has to make sense. -- users mailing list users@lists.fedoraproject.org To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
Re: Network Speed issues on Fedora 12
On Thu, 2010-06-03 at 19:42 -0700, alan wrote: I have a couple of systems with gigabit ethernet cards. If I copy a large quantity of data to the machine I notice the data throughput start to fall off after about 4-5 gigs. It keeps getting slower and slower the more data that flows through the interface. Mention the actual speeds and type of drive hardware. Perhaps there's a caching issue that boosts apparent throughput at the start, then when you empty the cache, you're slowed down to the throughput speed of the drive. I remember that when the first high speed UDMA hard drives came out. People went wow, 66 megabits a second. Then found out only the first burst came out that fast, the rest was slower. Much slower. -- [...@localhost ~]$ uname -r 2.6.27.25-78.2.56.fc9.i686 Don't send private replies to my address, the mailbox is ignored. I read messages from the public lists. -- users mailing list users@lists.fedoraproject.org To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
