Messages in this thread | | | Date | Mon, 24 May 2004 03:25:53 +0200 | From | Jakob Oestergaard <> | Subject | Re: Help understanding slow down |
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On Sun, May 23, 2004 at 06:04:55PM -0700, William Lee Irwin III wrote: > On Sun, May 23, 2004 at 05:57:51PM -0700, Phy Prabab wrote: > > Just for more clarification, here is a perfect > > example: > > 2.6.7-p1: > > 24.86user 51.77system 2:58.87elapsed 42%CPU > > (0avgtext+0avgdata 0maxresident)k > > 0inputs+0outputs (13major+7591686minor)pagefaults > > 0swaps > > 2.4.21: > > 28.68user 34.98system 1:12.34elapsed 87%CPU > > (0avgtext+0avgdata 0maxresident)k > > 0inputs+0outputs (5691267major+1130523minor)pagefaults > > 0swaps > > Thanks. This reveals that the performance regression is system time.
Eh, not if I read the numbers right:
2.6.7-p1: 24.86user 51.77system 2:58.87elapsed 42%CPU
24.86 + 51.77 = 76.63 seconds on CPU, 102.24 seconds of waiting
2.4.21: 28.68user 34.98system 1:12.34elapsed 87%CPU
28.68 + 34.98 = 63.66 seconds on CPU, 8.68 seconds of waiting
So, 2.6.7-p1 spends 16.79 seconds more in the kernel as you observed, but it spends 93.56 seconds more waiting for I/O (or whatever).
Unless I'm totally missing something, the wait seems to be the regression.
/ jakob
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