Re: O_DIRECT in freebsd

From: Doug McNaught <doug(at)mcnaught(dot)org>
To: "scott(dot)marlowe" <scott(dot)marlowe(at)ihs(dot)com>
Cc: Christopher Kings-Lynne <chriskl(at)familyhealth(dot)com(dot)au>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: O_DIRECT in freebsd
Date: 2003-10-29 14:57:54
Message-ID: m3u15snlal.fsf@varsoon.wireboard.com
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"scott.marlowe" <scott(dot)marlowe(at)ihs(dot)com> writes:

> I would think the biggest savings could come from using directIO for
> vacuuming, so it doesn't cause the kernel to flush buffers.
>
> Would that be just as hard to implement?

Two words: "cache coherency".

-Doug

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