On Thu, Apr 07, 2011 at 10:10:52AM -0700, Sunil Mushran wrote: > On 04/07/2011 09:40 AM, Darrick J. Wong wrote: > >That said, I haven't really quantified the performance impact of this naive > >approach yet, so I wonder -- did you see a similar scenario with ocfs2, and > >what kind of performance increase did you get by adapting the code to use the > >jbd2 trigger? If there's potentially a large increase, it would be interesting > >to apply the same conversion to the group descriptor checksumming code too. > > Joel Becker may remember the overhead. He wrote the patch. That said we have few > differences. ocfs2 has larger (blocksized) inodes. Also, it computes ECC. The code > is in fs/ocfs2/blockcheck.c. ocfs2 does the journal access/journal dirty cycle a lot more than extN. I think you'd want to generate your own numbers. Joel -- "Conservative, n. A statesman who is enamoured of existing evils, as distinguished from the Liberal, who wishes to replace them with others." - Ambrose Bierce, The Devil's Dictionary http://www.jlbec.org/ jlbec@xxxxxxxxxxxx -- 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
