Messages in this thread | | | Date | Tue, 4 Nov 2003 12:30:23 -0800 (PST) | From | Linus Torvalds <> | Subject | Re: ext3 performance inconsistencies, 2.4/2.6 |
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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.
> It is probably worth rerunning the tests with LD_ASSUME_KERNEL=2.4.1 on > the Red Hat kernel.
That would be interesting.
Linus
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