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Message-ID: <4811FEB6.60209@redhat.com> Date: Fri, 25 Apr 2008 10:54:30 -0500 From: Eric Sandeen <sandeen@...hat.com> To: Abhishek Rai <abhishekrai@...gle.com> CC: Andreas Dilger <adilger@....com>, linux-ext4@...r.kernel.org Subject: Re: [PATCH] Clustering indirect blocks in Ext3 (was Ext2) Eric Sandeen wrote: > Abhishek Rai wrote: >> This patch modifies the block allocation strategy in ext3 in order to >> improve fsck performance. This was initially sent out as a patch for >> ext2, but given the lack of ongoing development on ext2, I have >> crossported it to ext3 instead. Slow fsck is not a serious problem on >> ext3 due to journaling, but once in a while users do need to run full >> fsck on their ext3 file systems. This can be due to several reasons: >> (1) bad disk, bad crash, etc, (2) bug in jbd/ext3, and (3) every few >> reboots, it's good to run fsck anyway. This patch will help reduce >> full fsck time for ext3. I've seen 50-65% reduction in fsck time when >> using this patch on a near-full file system. With some fsck >> optimizations, this figure becomes 80%. > > For what it's worth, this speeds large file removals, too: > > http://people.redhat.com/esandeen/rm_test/ext3_metacluster_rm.png > http://people.redhat.com/esandeen/rm_test/ext3_rm.png Or, for more direct comparison: http://people.redhat.com/esandeen/rm_test/ext3_rm_stock_vs_metacluster.png -Eric -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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