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 speed tests consume significantly less CPU then wget/firefox/ktorrent > download. I > don't know why. > Dmitrij D. Czarkoff has 6% interruptions load during samba download (1.3 > MB/s, urtwn). > I sent bug report but by now it's unreplied. > > SSD write (dd if=/dev/zero of=... bs=1M): 10% unencrypted, 50% encrypted > (softraid0). > Disk read doesn't load cause interruptions load. > USB stick dd: essentially no interruptions load (2 MB/s) > > 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 and profile interruption handlers. > 2) Is there any OpenBSD kernel profiling support? High resolution clocks, > tick counters. do you observe the same problem with the GENERIC kernel? -- Alexandre
