Messages in this thread | | | Subject | Re: ext3 performance inconsistencies, 2.4/2.6 | From | Paul Venezia <> | Date | Tue, 04 Nov 2003 16:07:43 -0500 |
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On Tue, 2003-11-04 at 15:30, Linus Torvalds wrote: > On Tue, 4 Nov 2003, Bill Rugolsky Jr. wrote: > > > > Unless bonnie++ is using the _unlocked() variants, it might be an issue of > > the mutex overhead from NPTL v. LinuxThreads. Red Hat 9 has its share > > of NPTL bugs. > > Hmm.. That would easily explain the differences, since NPTL will trigger > both on 2.6.0 and the RH-2.4 kernel, but not on the standard 2.4.22 > kernel. > > But there really should be zero contention on the stdio data structures, > so the locking would have to be _seriously_ broken to make that kind o > fdifference (not necessarily buggy, but seriously badly implemented). > > A non-contended lock should be at most one locked instruction if well > done, both on LinuxThreads and NPTL.
Good point...
A truncated strace under 2.4.22 is here: http://groove.jpj.net/bonnie-strace-trunc
It's incomplete, but shows the putc calls.
> > It is probably worth rerunning the tests with LD_ASSUME_KERNEL=2.4.1 on > > the Red Hat kernel. > > That would be interesting.
Tests are running now. Updates as events warrant.
-Paul
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