Messages in this thread | | | Date | Fri, 19 May 2006 11:34:28 +0200 (MEST) | From | Jan Engelhardt <> | Subject | XFS write speed drop |
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Hello,
I have noticed that after an upgrade from 2.6.16-rcX -> 2.6.17-rc4, writes to one (hdc) xfs filesystem have become significantly slower (factor 6 to 8), like if -o sync (or funky journal options on ext3) was on. Also, reads would stall until writes have completed. I would only expect such behavior when /proc/sys/vm/dirty_* are set to high values (like 95%, like I do on a notebook). hda remained fast.
It eventually turned out that it are the log barriers; hda does not support barriers and XFS gave a nice kernel message hint that pointed me to try out a mount flag. -o nobarrier makes it fast again.
Jan Engelhardt -- - 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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