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SubjectO_DIRECT support important for high data volume applications
When will we see O_DIRECT support included in
the Linux kernel?

We have now tested 2.4.4 with the o_direct-5 patch,
and it still works perfectly.

I sent an email about two weeks ago asking if the O_DIRECT
patch by Andrea Archangeli would be included in 2.4.4.
2.4.4 has since been released, but only with the rawio
patch, which Andrea considered as a bugfix patch.

The O_DIRECT patch is in my view really important
for high data volume applications that do
caching internally. The performance graph
I posted earlier should be enough evidence.

If I remember correctly, Stephen Tweedie implemented
O_DIRECT support already back in 1999. Why this
implementation was not included, I do not know.

Linux would be lacking behind other OSs if not
O_DIRECT support is added. All major commercial
OSs have this capability.

Michael Susæg, M.Eng. Mail:
Software Engineer Web:
Fast Search & Transfer ASA Phone: +47 21 60 12 27
P.O. Box 1677 Vika Fax: +47 21 60 12 01
NO-0120 Oslo, NORWAY Mob: +47 90 06 38 70

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