zerocopy NFS

Hello

I'm tuning knfsd and I implemented zerocopy knfsd. Everyone knows knfsd copies file data many times, so I tried to reduce the copies. nfsd_read() doesn't copy filedata anymore. This works pretty fine and performance is improved.

Following patches patches are against linux 2.5.7

ftp:/ftp.valinux.co.jp/pub/people/taka/tune/2.5.7/va01-knfsd-zerocopy-vfsread-2.5.7.patch ftp:/ftp.valinux.co.jp/pub/people/taka/tune/2.5.7/va02-kmap-multplepages-2.5.7.patch

I also have patches against linux 2.4.18

ftp:/ftp.valinux.co.jp/pub/people/taka/tune/2.4.18/va01-knfsd-zerocopy-vfsread-2.4.18.patch ftp:/ftp.valinux.co.jp/pub/people/taka/tune/2.4.18/va02-kmap-multplepages-2.4.18.patch

Now I'm designing new mechanism to send pagecache directly using sendpage.

I'm waiting for your comments.

Regards,
Hirokazu Takahashi
VP Engineering Dept.
VA Linux Systems Japan

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