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SubjectRe: Kernel performance in reference to 2.4.5pre1
Andrew Morton [mailto:akpm@zip.com.au] wrote:
> SFS is a rather specialised workload, and synchronous NFS exports
> are not a thing which gets a lot of attention. It could be one
> small, hitherto unnoticed change which caused this performance
> regression. And it appears that the change occurred between 2.4.5
> and 2.4.7.

Cary, also note that Andrew did some work with ext3 which can greatly
improve the performance of synchronous I/O. Granted, it doesn't fix
any performance issues in the VM or VFS that may have been introduced,
but if you are looking for good benchmark numbers, give ext3 a try.

Use a large journal to avoid journal flushes for sync I/O. See:
http://marc.theaimsgroup.com/?l=linux-kernel&m=99650624414465&w=4

Cheers, Andreas
--
Andreas Dilger \ "If a man ate a pound of pasta and a pound of antipasto,
\ would they cancel out, leaving him still hungry?"
http://www-mddsp.enel.ucalgary.ca/People/adilger/ -- Dogbert

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