* regression - slow git rebase performance with 2.6.39-rcX kernel @ 2011-04-12 12:45 Zdenek Kabelac 2011-04-12 12:51 ` Pekka Enberg 0 siblings, 1 reply; 5+ messages in thread From: Zdenek Kabelac @ 2011-04-12 12:45 UTC (permalink / raw) To: Linux Kernel Mailing List Hi I'm noticing quite slower speed of my git rebase commands on my git tree compared with 2.6.38 kernel. I've T61 with SSD disc drive, ext4 fs, and by default deadline disk io scheduler The counter showing the number of 'rebased' patches on top of master is going much slower. When I boot 2.6.38 kernel it's much faster. Is it a known problem - or do I need to make a bisect ? Zdenek ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: regression - slow git rebase performance with 2.6.39-rcX kernel 2011-04-12 12:45 regression - slow git rebase performance with 2.6.39-rcX kernel Zdenek Kabelac @ 2011-04-12 12:51 ` Pekka Enberg 2011-04-12 13:07 ` Jens Axboe 0 siblings, 1 reply; 5+ messages in thread From: Pekka Enberg @ 2011-04-12 12:51 UTC (permalink / raw) To: Zdenek Kabelac Cc: Linux Kernel Mailing List, Linus Torvalds, Andrew Morton, Theodore Tso, Jens Axboe Hi, [ Fixed your empty CC list. ] On Tue, Apr 12, 2011 at 3:45 PM, Zdenek Kabelac <zdenek.kabelac@gmail.com> wrote: > I'm noticing quite slower speed of my git rebase commands on my git > tree compared with 2.6.38 kernel. > I've T61 with SSD disc drive, ext4 fs, and by default deadline disk > io scheduler > The counter showing the number of 'rebased' patches on top of master > is going much slower. > When I boot 2.6.38 kernel it's much faster. > > Is it a known problem - or do I need to make a bisect ? No, I don't think it's a known problem. Git bisect would be helpful, obviously. Pekka ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: regression - slow git rebase performance with 2.6.39-rcX kernel 2011-04-12 12:51 ` Pekka Enberg @ 2011-04-12 13:07 ` Jens Axboe 2011-04-12 13:59 ` Zdenek Kabelac 0 siblings, 1 reply; 5+ messages in thread From: Jens Axboe @ 2011-04-12 13:07 UTC (permalink / raw) To: Pekka Enberg Cc: Zdenek Kabelac, Linux Kernel Mailing List, Linus Torvalds, Andrew Morton, Theodore Tso On 2011-04-12 14:51, Pekka Enberg wrote: > Hi, > > [ Fixed your empty CC list. ] > > On Tue, Apr 12, 2011 at 3:45 PM, Zdenek Kabelac > <zdenek.kabelac@gmail.com> wrote: >> I'm noticing quite slower speed of my git rebase commands on my git >> tree compared with 2.6.38 kernel. >> I've T61 with SSD disc drive, ext4 fs, and by default deadline disk >> io scheduler >> The counter showing the number of 'rebased' patches on top of master >> is going much slower. >> When I boot 2.6.38 kernel it's much faster. >> >> Is it a known problem - or do I need to make a bisect ? > > No, I don't think it's a known problem. Git bisect would be helpful, > obviously. Definitely, interesting. Bisect would help. I'll try a similar workload here and see if I see any differences. How big is your rebase, and what are the runtimes (approximately) on .38 vs .39-rc? -- Jens Axboe ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: regression - slow git rebase performance with 2.6.39-rcX kernel 2011-04-12 13:07 ` Jens Axboe @ 2011-04-12 13:59 ` Zdenek Kabelac 2011-04-12 14:00 ` Jens Axboe 0 siblings, 1 reply; 5+ messages in thread From: Zdenek Kabelac @ 2011-04-12 13:59 UTC (permalink / raw) To: Jens Axboe Cc: Pekka Enberg, Linux Kernel Mailing List, Linus Torvalds, Andrew Morton, Theodore Tso 2011/4/12 Jens Axboe <jaxboe@fusionio.com>: > On 2011-04-12 14:51, Pekka Enberg wrote: >> Hi, >> >> [ Fixed your empty CC list. ] >> >> On Tue, Apr 12, 2011 at 3:45 PM, Zdenek Kabelac >> <zdenek.kabelac@gmail.com> wrote: >>> I'm noticing quite slower speed of my git rebase commands on my git >>> tree compared with 2.6.38 kernel. >>> I've T61 with SSD disc drive, ext4 fs, and by default deadline disk >>> io scheduler >>> The counter showing the number of 'rebased' patches on top of master >>> is going much slower. >>> When I boot 2.6.38 kernel it's much faster. >>> >>> Is it a known problem - or do I need to make a bisect ? >> >> No, I don't think it's a known problem. Git bisect would be helpful, >> obviously. > > Definitely, interesting. Bisect would help. I'll try a similar workload > here and see if I see any differences. How big is your rebase, and what > are the runtimes (approximately) on .38 vs .39-rc? > I've made just quick build with the small kernel without debug options enable - and the time is then equal with 2.6.38. So the difference is probably somewhere in debug build - I assume some debug option slowed down between 2.6.38 - 2.6.39 significantly. Zdenek ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: regression - slow git rebase performance with 2.6.39-rcX kernel 2011-04-12 13:59 ` Zdenek Kabelac @ 2011-04-12 14:00 ` Jens Axboe 0 siblings, 0 replies; 5+ messages in thread From: Jens Axboe @ 2011-04-12 14:00 UTC (permalink / raw) To: Zdenek Kabelac Cc: Pekka Enberg, Linux Kernel Mailing List, Linus Torvalds, Andrew Morton, Theodore Tso On 2011-04-12 15:59, Zdenek Kabelac wrote: > 2011/4/12 Jens Axboe <jaxboe@fusionio.com>: >> On 2011-04-12 14:51, Pekka Enberg wrote: >>> Hi, >>> >>> [ Fixed your empty CC list. ] >>> >>> On Tue, Apr 12, 2011 at 3:45 PM, Zdenek Kabelac >>> <zdenek.kabelac@gmail.com> wrote: >>>> I'm noticing quite slower speed of my git rebase commands on my git >>>> tree compared with 2.6.38 kernel. >>>> I've T61 with SSD disc drive, ext4 fs, and by default deadline disk >>>> io scheduler >>>> The counter showing the number of 'rebased' patches on top of master >>>> is going much slower. >>>> When I boot 2.6.38 kernel it's much faster. >>>> >>>> Is it a known problem - or do I need to make a bisect ? >>> >>> No, I don't think it's a known problem. Git bisect would be helpful, >>> obviously. >> >> Definitely, interesting. Bisect would help. I'll try a similar workload >> here and see if I see any differences. How big is your rebase, and what >> are the runtimes (approximately) on .38 vs .39-rc? >> > > I've made just quick build with the small kernel without debug options > enable - and the time is then equal with 2.6.38. So the difference is > probably somewhere in debug build - I assume some debug option > slowed down between 2.6.38 - 2.6.39 significantly. Good, so it's down to debug. Thanks for testing. -- Jens Axboe ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2011-04-12 14:00 UTC | newest] Thread overview: 5+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2011-04-12 12:45 regression - slow git rebase performance with 2.6.39-rcX kernel Zdenek Kabelac 2011-04-12 12:51 ` Pekka Enberg 2011-04-12 13:07 ` Jens Axboe 2011-04-12 13:59 ` Zdenek Kabelac 2011-04-12 14:00 ` Jens Axboe
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