Re: ext2fs kernel profiling: most of the time in thread management

2011-12-30 Thread Thomas Bushnell, BSG
2011/12/30 Jérémie Koenig > On Thu, Dec 29, 2011 at 1:25 AM, Samuel Thibault > wrote: > > [...], but I believe it's still a bit revealing: I had already noticed > > that ext2fs spends most of its time in the kernel (like 90%), and it > > here seems we're spending a lot of time just managing the

Re: ext2fs kernel profiling: most of the time in thread management

2011-12-30 Thread Samuel Thibault
Jérémie Koenig, le Fri 30 Dec 2011 12:46:39 +0100, a écrit : > On Thu, Dec 29, 2011 at 1:25 AM, Samuel Thibault > wrote: > > [...], but I believe it's still a bit revealing: I had already noticed > > that ext2fs spends most of its time in the kernel (like 90%), and it > > here seems we're spending

Re: ext2fs kernel profiling: most of the time in thread management

2011-12-30 Thread Jérémie Koenig
On Thu, Dec 29, 2011 at 1:25 AM, Samuel Thibault wrote: > [...], but I believe it's still a bit revealing: I had already noticed > that ext2fs spends most of its time in the kernel (like 90%), and it > here seems we're spending a lot of time just managing the ext2fs thread > sleeps (no, there aren

Re: ext2fs kernel profiling: most of the time in thread management

2011-12-29 Thread Samuel Thibault
Samuel Thibault, le Thu 29 Dec 2011 01:25:36 +0100, a écrit : > It might be biaised by the clock not being able to tick everywhere in > the kernel (though I guess e.g. most of the IPC machinery is running at > ipl0?), But the linux drivers do get an opportunity to run their bottom halves etc. when

Re: ext2fs kernel profiling: most of the time in thread management

2011-12-29 Thread Sergio Lopez
El Thu, 29 Dec 2011 01:25:36 +0100 Samuel Thibault escribió: > It might be biaised by the clock not being able to tick everywhere in > the kernel (though I guess e.g. most of the IPC machinery is running > at ipl0?), but I believe it's still a bit revealing: I had already > noticed that ext2fs sp

Re: ext2fs kernel profiling: most of the time in thread management

2011-12-29 Thread Samuel Thibault
Svante Signell, le Thu 29 Dec 2011 11:05:20 +0100, a écrit : > On Thu, 2011-12-29 at 01:25 +0100, Samuel Thibault wrote: > > I've done some stat-based kernel profiling (I'll have to post how to do > > it on the wiki sometime) on ext2fs doing nothing more than > > > > while true; do rm -f blop ; \c

Re: ext2fs kernel profiling: most of the time in thread management

2011-12-29 Thread Svante Signell
On Thu, 2011-12-29 at 01:25 +0100, Samuel Thibault wrote: > Hello, > > I've done some stat-based kernel profiling (I'll have to post how to do > it on the wiki sometime) on ext2fs doing nothing more than > > while true; do rm -f blop ; \cp -f blip blop ; done > It might be biaised by the clock n