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From: <mika.penttila@kolumbus.fi>
To: Herbert Xu <herbert@gondor.apana.org.au>,
	Linus Torvalds <torvalds@osdl.org>,
	Christoph Hellwig <hch@infradead.org>, <axboe@suse.de>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [SCSI] Set max_phys_segments to sg_tablesize
Date: Wed, 15 Oct 2003 15:37:22 +0300	[thread overview]
Message-ID: <20031015123722.CSSJ7495.fep07-app.kolumbus.fi@mta.imail.kolumbus.fi> (raw)

>>> Many SCSI host drivers assume that use_sg will be <= sg_tablesize.
>>> Hence they may break under 2.6 as the number of physical segments
>>> is not limited by sg_tablesize.  This patch fixes that.
>> 
>> Physical segments don't matter,  hw segments does and it's bounded >by sg_tablesize.

>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.

--Mika



             reply	other threads:[~2003-10-15 12:37 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-10-15 12:37 mika.penttila [this message]
2003-10-16  4:51 ` [SCSI] Set max_phys_segments to sg_tablesize David S. Miller
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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