Re: KVM slow LAMP guest
On 24-8-2015 1:26, Wanpeng Li wrote:
On 8/24/15 3:18 AM, Hansa wrote:
On 16-7-2015 13:27, Paolo Bonzini wrote:
On 15/07/2015 22:02, "C. Bröcker" wrote:
What OS is this? Is it RHEL/CentOS? If so, halt_poll_ns will be in 6.7
which will be out in a few days/weeks.
Paolo
OK. As said CentOS 6.6.
But where do I put this parameter?
You can add "kvm.halt_poll_ns=50" to the kernel command line. If
you have the parameter, you have the
/sys/module/kvm/parameters/halt_poll_ns file.
Hi,
I upgraded to the CentOS 6.7 release which came out last month and as promised
the halt_poll_ns parameter was available.
Last week I tested the availability status every 5 minutes on my Wordpress VM's
with the halt_poll_ns kernel param set on DOM0. I'm pleased to announce that it
solves the problem!
How much seconds to load your Wordpress site this time?
Regards,
Wanpeng Li
The average is around 0.4 seconds to load my "heaviest" site on my slowest
machine.
On the VM server I issued the command below every eleven minutes:
date >> curltest-file; _
top -b -n 1 | sed -n '7,12p' >> curltest-file; _
curl -o /dev/null -s -w"time_total: %{time_total}\\n" https://my.domain.com | perl -pe 'BEGIN
{use POSIX;} print strftime("%Y-%m-%d %H:%M:%S ", localtime)' >> curltest-file
This gives me the total time for displaying my site on a local machine. It also
includes a 'top' command to display which processes are running at each sample.
All is saved in a file called curltest-file.
I found 7 occurrences in my curltest-file of a time_total larger than 20
seconds. Top however didn't show any significant CPU or IO activity at those
sampled times. Further investigations shows me that they are related to a known
(gravatar) issue in the Wordpress Jetpack plugin. I didn't include these
samples in the average total.
Cheers and good luck tweaking your sites!
Best, Hansa
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Re: KVM slow LAMP guest
On 26-8-2015 0:33, Wanpeng Li wrote:
On the VM server I issued the command below every eleven minutes:
date >> curltest-file; _
top -b -n 1 | sed -n '7,12p' >> curltest-file; _
curl -o /dev/null -s -w"time_total: %{time_total}\\n" https://my.domain.com | perl -pe 'BEGIN
{use POSIX;} print strftime("%Y-%m-%d %H:%M:%S ", localtime)' >> curltest-file
This gives me the total time for displaying my site on a local machine. It also
includes a 'top' command to display which processes are running at each sample.
All is saved in a file called curltest-file.
I found 7 occurrences in my curltest-file of a time_total larger than 20
seconds. Top however didn't show any significant CPU or IO activity at those
sampled times. Further investigations shows me that they are related to a known
(gravatar) issue in the Wordpress Jetpack plugin. I didn't include these
samples in the average total.
If you just use halt_poll_ns or both halt_poll_ns and idle=poll in guest?
I just use kvm.halt_poll_ns=50
Should I try some different tests?
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KVM slow LAMP guest
Hi, I have a LAMP server as guest in KVM. Whenever the server is idle for some time it takes about 30 seconds to load a Wordpress site. If the server is not idle the site shows up in max 5 seconds. I've already turned of power management in the guest by passing GRUB_CMDLINE_LINUX_DEFAULT="apm=off" in /etc/default/grub. This has no effect. Does KVM do some power management on guests? If so, how do I turn this off for my LAMP guest? Best, Hansa -- 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: KVM slow LAMP guest
On 14-7-2015 23:16, Paolo Bonzini wrote: On 14/07/2015 21:54, "Hansa" wrote: [1] https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f7819512996361280b86259222456fcf15aad926 Sorry David. That is not an option. It's a production server on 2.6 kernel. 4.0 kernel is not in Base repos and I don't know which impact installing the newer kernel version will have on this server. Any other options? You could backport the patch to the version you have. What OS is this? Is it RHEL/CentOS? If so, halt_poll_ns will be in 6.7 which will be out in a few days/weeks. Paolo CentOS release 6.6 (Final) -Hansa -- 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: KVM slow LAMP guest
On 16-7-2015 13:27, Paolo Bonzini wrote: On 15/07/2015 22:02, "Hansa" wrote: What OS is this? Is it RHEL/CentOS? If so, halt_poll_ns will be in 6.7 which will be out in a few days/weeks. Paolo OK. As said CentOS 6.6. But where do I put this parameter? You can add "kvm.halt_poll_ns=50" to the kernel command line. If you have the parameter, you have the /sys/module/kvm/parameters/halt_poll_ns file. Thanks Paolo! I'll await the 6.7 release. Best, Hansa -- 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: KVM slow LAMP guest
On 16-7-2015 13:27, Paolo Bonzini wrote: On 15/07/2015 22:02, "C. Bröcker" wrote: What OS is this? Is it RHEL/CentOS? If so, halt_poll_ns will be in 6.7 which will be out in a few days/weeks. Paolo OK. As said CentOS 6.6. But where do I put this parameter? You can add "kvm.halt_poll_ns=50" to the kernel command line. If you have the parameter, you have the /sys/module/kvm/parameters/halt_poll_ns file. Hi, I upgraded to the CentOS 6.7 release which came out last month and as promised the halt_poll_ns parameter was available. Last week I tested the availability status every 5 minutes on my Wordpress VM's with the halt_poll_ns kernel param set on DOM0. I'm pleased to announce that it solves the problem! My guess is that a lot people out there have the same problem but do not know the solution. Why not put it in the kernel by default? Thanks a lot for all the help! - Hansa -- 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: KVM slow LAMP guest
On 24-8-2015 1:26, Wanpeng Li wrote: On 8/24/15 3:18 AM, Hansa wrote: On 16-7-2015 13:27, Paolo Bonzini wrote: On 15/07/2015 22:02, "C. Bröcker" wrote: What OS is this? Is it RHEL/CentOS? If so, halt_poll_ns will be in 6.7 which will be out in a few days/weeks. Paolo OK. As said CentOS 6.6. But where do I put this parameter? You can add "kvm.halt_poll_ns=50" to the kernel command line. If you have the parameter, you have the /sys/module/kvm/parameters/halt_poll_ns file. Hi, I upgraded to the CentOS 6.7 release which came out last month and as promised the halt_poll_ns parameter was available. Last week I tested the availability status every 5 minutes on my Wordpress VM's with the halt_poll_ns kernel param set on DOM0. I'm pleased to announce that it solves the problem! How much seconds to load your Wordpress site this time? Regards, Wanpeng Li I've only tested availability using the webmin's "Remote HTTP Service" monitoring tool. Currently it only times out when doing backups. I will do some tests with curl and let you know the result in a day or so. -- 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
