Re: interruptions

2013-11-15 Thread Alexandre Ratchov
On Fri, Nov 15, 2013 at 12:35:22AM +0400, Alexander Pakhomov wrote: dd unenc sp: sys 17% int 9% 164 MB/s dd_unenc_mp 30 sys 50 int 200 MB/s this roughly shows that a lot of CPUs time is wasted in interrupts in the MP case, probably spinning to grab the kernel_lock held by the other CPU.

interruptions

2013-11-14 Thread Alexander Pakhomov
Hi. I discovered high CPU0 interruptions load (amd64) in various cases. wifi (athn, urtwn): up to 100% at 2 MB/s download. Usually 50%. Grows faster then linear with net load. Sometimes system freezes for about a minute. Web speed tests consume significantly less CPU then wget/firefox/ktorrent

Re: interruptions

2013-11-14 Thread Alexandre Ratchov
On Thu, Nov 14, 2013 at 01:16:41PM +0400, Alexander Pakhomov wrote: Hi. I discovered high CPU0 interruptions load (amd64) in various cases. wifi (athn, urtwn): up to 100% at 2 MB/s download. Usually 50%. Grows faster then linear with net load. Sometimes system freezes for about a minute. Web

Re: interruptions

2013-11-14 Thread Gregory Edigarov
On 11/14/2013 03:19 PM, Alexandre Ratchov wrote: On Thu, Nov 14, 2013 at 01:16:41PM +0400, Alexander Pakhomov wrote: 1) What interruptions load should be considered normal? I used to think even 10% is too high. yes, though it depends on the workload I want to investigate the problem

Re: interruptions

2013-11-14 Thread Ville Valkonen
dmesg?

Re: interruptions

2013-11-14 Thread Alexander Pakhomov
14.11.2013, 17:20, Alexandre Ratchov a...@caoua.org: On Thu, Nov 14, 2013 at 01:16:41PM +0400, Alexander Pakhomov wrote:  Hi.  I discovered high CPU0 interruptions load (amd64) in various cases.  wifi (athn, urtwn): up to 100% at 2 MB/s download. Usually 50%. Grows faster  then linear

Re: interruptions

2013-11-14 Thread Alexander Pakhomov
+0400, Alexander Pakhomov wrote:   Hi.   I discovered high CPU0 interruptions load (amd64) in various cases.   wifi (athn, urtwn): up to 100% at 2 MB/s download. Usually 50%. Grows faster   then linear with net load. Sometimes system freezes for about a minute.   Web speed tests consume

Re: interruptions

2013-11-14 Thread Alexander Pakhomov
I was wrong. Kernel panics with splassert. So bug report I just sent is somehow connected with interruptions. 15.11.2013, 00:44, Alexander Pakhomov ker0...@yandex.ru: By the way boot sync in ddb cause kernel panic (both mp and sp). Will send next bug report in bugs@. Maybe this is connected