BFS vs. mainline scheduler benchmarks and measurements
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From: Ingo Molnar on 10 Sep 2009 03:00 * Peter Zijlstra <a.p.zijlstra(a)chello.nl> wrote: > On Wed, 2009-09-09 at 14:20 +0200, Jens Axboe wrote: > > > > One thing I also noticed is that when I have logged in, I run xmodmap > > manually to load some keymappings (I always tell myself to add this to > > the log in scripts, but I suspend/resume this laptop for weeks at the > > time and forget before the next boot). With the stock kernel, xmodmap > > will halt X updates and take forever to run. With BFS, it returned > > instantly. As I would expect. > > Can you provide a little more detail (I'm a xmodmap n00b), how > does one run xmodmap and maybe provide your xmodmap config? (and which version did you use, just in case it matters.) Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Jens Axboe on 10 Sep 2009 03:00 On Thu, Sep 10 2009, Peter Zijlstra wrote: > On Wed, 2009-09-09 at 14:20 +0200, Jens Axboe wrote: > > > > One thing I also noticed is that when I have logged in, I run xmodmap > > manually to load some keymappings (I always tell myself to add this to > > the log in scripts, but I suspend/resume this laptop for weeks at the > > time and forget before the next boot). With the stock kernel, xmodmap > > will halt X updates and take forever to run. With BFS, it returned > > instantly. As I would expect. > > Can you provide a little more detail (I'm a xmodmap n00b), how does one > run xmodmap and maybe provide your xmodmap config? Will do, let me get the notebook and strace time it on both bfs and mainline. -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Ingo Molnar on 10 Sep 2009 03:10 * Jens Axboe <jens.axboe(a)oracle.com> wrote: > On Thu, Sep 10 2009, Peter Zijlstra wrote: > > On Wed, 2009-09-09 at 14:20 +0200, Jens Axboe wrote: > > > > > > One thing I also noticed is that when I have logged in, I run xmodmap > > > manually to load some keymappings (I always tell myself to add this to > > > the log in scripts, but I suspend/resume this laptop for weeks at the > > > time and forget before the next boot). With the stock kernel, xmodmap > > > will halt X updates and take forever to run. With BFS, it returned > > > instantly. As I would expect. > > > > Can you provide a little more detail (I'm a xmodmap n00b), how > > does one run xmodmap and maybe provide your xmodmap config? > > Will do, let me get the notebook and strace time it on both bfs > and mainline. A 'perf stat' comparison would be nice as well - that will show us events strace doesnt show, and shows us the basic scheduler behavior as well. A 'full' trace could be done as well via trace-cmd.c (attached), if you enable: CONFIG_CONTEXT_SWITCH_TRACER=y and did something like: trace-cmd -s xmodmap ... > trace.txt Ingo
From: Jens Axboe on 10 Sep 2009 03:40 On Thu, Sep 10 2009, Jens Axboe wrote: > On Thu, Sep 10 2009, Peter Zijlstra wrote: > > On Wed, 2009-09-09 at 14:20 +0200, Jens Axboe wrote: > > > > > > One thing I also noticed is that when I have logged in, I run xmodmap > > > manually to load some keymappings (I always tell myself to add this to > > > the log in scripts, but I suspend/resume this laptop for weeks at the > > > time and forget before the next boot). With the stock kernel, xmodmap > > > will halt X updates and take forever to run. With BFS, it returned > > > instantly. As I would expect. > > > > Can you provide a little more detail (I'm a xmodmap n00b), how does one > > run xmodmap and maybe provide your xmodmap config? > > Will do, let me get the notebook and strace time it on both bfs and > mainline. Here's the result of running perf stat xmodmap .xmodmap-carl on the notebook. I have attached the .xmodmap-carl file, it's pretty simple. I have also attached the output of strace -o foo -f -tt xmodmap ..xmodmap-carl when run on 2.6.31-rc9. 2.6.31-rc9-bfs210 Performance counter stats for 'xmodmap .xmodmap-carl': 153.994976 task-clock-msecs # 0.990 CPUs (scaled from 99.86%) 0 context-switches # 0.000 M/sec (scaled from 99.86%) 0 CPU-migrations # 0.000 M/sec (scaled from 99.86%) 315 page-faults # 0.002 M/sec (scaled from 99.86%) <not counted> cycles <not counted> instructions <not counted> cache-references <not counted> cache-misses 0.155573406 seconds time elapsed 2.6.31-rc9 Performance counter stats for 'xmodmap .xmodmap-carl': 8.529265 task-clock-msecs # 0.001 CPUs 23 context-switches # 0.003 M/sec 1 CPU-migrations # 0.000 M/sec 315 page-faults # 0.037 M/sec <not counted> cycles <not counted> instructions <not counted> cache-references <not counted> cache-misses 11.804293482 seconds time elapsed -- Jens Axboe
From: Ingo Molnar on 10 Sep 2009 03:50
* Jens Axboe <jens.axboe(a)oracle.com> wrote: > On Thu, Sep 10 2009, Jens Axboe wrote: > > On Thu, Sep 10 2009, Peter Zijlstra wrote: > > > On Wed, 2009-09-09 at 14:20 +0200, Jens Axboe wrote: > > > > > > > > One thing I also noticed is that when I have logged in, I > > > > run xmodmap manually to load some keymappings (I always tell > > > > myself to add this to the log in scripts, but I > > > > suspend/resume this laptop for weeks at the time and forget > > > > before the next boot). With the stock kernel, xmodmap will > > > > halt X updates and take forever to run. With BFS, it > > > > returned instantly. As I would expect. > > > > > > Can you provide a little more detail (I'm a xmodmap n00b), how does one > > > run xmodmap and maybe provide your xmodmap config? > > > > Will do, let me get the notebook and strace time it on both bfs and > > mainline. > > Here's the result of running perf stat xmodmap .xmodmap-carl on > the notebook. I have attached the .xmodmap-carl file, it's pretty > simple. I have also attached the output of strace -o foo -f -tt > xmodmap .xmodmap-carl when run on 2.6.31-rc9. > > 2.6.31-rc9-bfs210 > > Performance counter stats for 'xmodmap .xmodmap-carl': > > 153.994976 task-clock-msecs # 0.990 CPUs (scaled from 99.86%) > 0 context-switches # 0.000 M/sec (scaled from 99.86%) > 0 CPU-migrations # 0.000 M/sec (scaled from 99.86%) > 315 page-faults # 0.002 M/sec (scaled from 99.86%) > <not counted> cycles > <not counted> instructions > <not counted> cache-references > <not counted> cache-misses > > 0.155573406 seconds time elapsed (Side question: what hardware is this - why are there no hw counters? Could you post the /proc/cpuinfo?) > 2.6.31-rc9 > > Performance counter stats for 'xmodmap .xmodmap-carl': > > 8.529265 task-clock-msecs # 0.001 CPUs > 23 context-switches # 0.003 M/sec > 1 CPU-migrations # 0.000 M/sec > 315 page-faults # 0.037 M/sec > <not counted> cycles > <not counted> instructions > <not counted> cache-references > <not counted> cache-misses > > 11.804293482 seconds time elapsed Thanks - so we context-switch 23 times - possibly to Xorg. But 11 seconds is extremely long. Will try to reproduce it. Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |