From: Gerd Knorr <kraxel@bytesex.org>
To: linux-kernel@vger.kernel.org
Subject: Re: changes to kiobuf support in 2.4.(?)4
Date: 2 Aug 2001 08:23:37 GMT [thread overview]
Message-ID: <slrn9mi3g9.36p.kraxel@bytesex.org> (raw)
In-Reply-To: <10108012254.ZM192062@classic.engr.sgi.com> <20010802084259.H29065@athlon.random>
> The reason of the large allocation and to put the bh inside the kiobuf
> is that if we do a small allocation then we end with a zillion of
> allocations of the bh and freeing of the bh at every I/O!! (not even at
> every read/write syscall, much more frequently)
That is true for block device I/O only. Current bttv versions are using
kiobufs to lock down user pages for DMA. But I don't need the bh's to
transfer the video frames ...
Gerd
--
Damn lot people confuse usability and eye-candy.
next prev parent reply other threads:[~2001-08-02 8:40 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-08-02 5:55 changes to kiobuf support in 2.4.(?)4 Jeremy Higdon
2001-08-02 6:43 ` Andrea Arcangeli
2001-08-02 7:31 ` Jeremy Higdon
2001-08-02 7:45 ` Andrea Arcangeli
2001-08-02 8:10 ` Jeremy Higdon
2001-08-02 8:24 ` Andrea Arcangeli
2001-08-02 8:42 ` Jeremy Higdon
2001-08-02 9:11 ` Andrea Arcangeli
2001-08-02 9:25 ` Jeremy Higdon
2001-08-02 10:00 ` Andrea Arcangeli
2001-08-02 8:23 ` Gerd Knorr [this message]
2001-08-03 11:32 ` Ingo Oeser
2001-08-03 12:45 ` Andrea Arcangeli
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