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On Tue, Nov 04, 2003 at 11:36:55AM -0800, Linus Torvalds wrote: > > I've been running bonnie++ filesystems testing on an IBM x335 server > > recently. This box uses the MPT RAID controller, but I've disabled the > > RAID and am addressing the disks individually. I'm getting wildly > > different results between 2.4.20-20-9 (RedHat mod), 2.4.22 (stock), and > > 2.6.0-test9. > > Interesting. The 2.4.22 sequential "per char" results are totally out of > line with anything else. > > The thing is, the overhead for the per-char stuff really should be almost > all in user space unless I'm mistaken. It's just using getch/putch, no? 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. It is probably worth rerunning the tests with LD_ASSUME_KERNEL=2.4.1 on the Red Hat kernel. Regards, Bill Rugolsky - 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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