On Sunday 14 February 2010, James Cloos wrote: > Sometime between rc6 and rc7 all filesystem I/O started using 100% CPU, > usually on the order of 60% sys, 40% user. > > I've tried this with each of ext4, jfs and btrfs filesystems. All show > the same issue. > > Using dd(1) to read from the block specials directly works as well and > as fast as it always has; only reading or writing to mounted filesystems > is affected. > > Box is 32-bit x86, PentiumIII-M; drives are ide using libata. > > If the btrfs fs is mounted, the slowdown is enought to trigger the > hung_task call trace (120s) on the btrfs-transac process. > > But the regression is just as apparent when only jfs and ext4 are mounted. > > The only filesystems I've found which avoid the regression are tmpfs and > devtmpfs. > > I didn't have time to write up a report when I noticed this in rc7 but > had to boot back into rc6 for work. > > Some of the commits since rc7 looked like they might have addressed this > regression, but it persists in rc8. I have created the bug entry at http://bugzilla.kernel.org/show_bug.cgi?id=15306 for your report. Thanks, Rafael -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
