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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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||
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