From: "David S. Miller" <davem@redhat.com>
To: <mika.penttila@kolumbus.fi>
Cc: herbert@gondor.apana.org.au, torvalds@osdl.org,
hch@infradead.org, axboe@suse.de, linux-kernel@vger.kernel.org
Subject: Re: [SCSI] Set max_phys_segments to sg_tablesize
Date: Wed, 15 Oct 2003 21:51:34 -0700 [thread overview]
Message-ID: <20031015215134.6f5a0479.davem@redhat.com> (raw)
In-Reply-To: <20031015123722.CSSJ7495.fep07-app.kolumbus.fi@mta.imail.kolumbus.fi>
On Wed, 15 Oct 2003 15:37:22 +0300
<mika.penttila@kolumbus.fi> wrote:
> >It does matter if the driver can't cope with it.
>
> But this fix may hurt performance with well behaving drivers in
> iommu systems. It's better to fix the broken drivers I think.
That's absolutely correct.
If you add Herbert's change, you will effectively turn off all
of the IOMMU coalescing benefits we designed into the block layer.
Please don't apply it, fix the broken drivers instead.
next prev parent reply other threads:[~2003-10-16 4:51 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-15 12:37 [SCSI] Set max_phys_segments to sg_tablesize mika.penttila
2003-10-16 4:51 ` David S. Miller [this message]
2003-10-16 6:57 ` Jens Axboe
-- strict thread matches above, loose matches on Subject: below --
2003-10-15 12:14 mika.penttila
2003-10-15 12:31 ` Herbert Xu
2003-10-15 11:57 Herbert Xu
2003-10-15 12:02 ` Jens Axboe
2003-10-15 12:06 ` Herbert Xu
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