From: Alex Williamson <alex_williamson@hp.com>
To: linux-ia64@vger.kernel.org
Subject: Re: SCSI ERRORS triggered by BIO_VMERGE_BOUNDARY
Date: Mon, 23 Jun 2003 15:04:43 +0000 [thread overview]
Message-ID: <marc-linux-ia64-105638090201213@msgid-missing> (raw)
In-Reply-To: <marc-linux-ia64-105604433402604@msgid-missing>
Grant Grundler wrote:
>
> There might well be. It's easy to get the block merging code
> wrong when merging random chunks which can be bigger or smaller
> than PAGE_SIZE. My gut feeling this can all get ripped out of
> 2.5 sba_iommu.c if the bio code is going to merge for us. That
> means pci_map_sg() support only needs to map each address/len
> pair and forget trying to merge them.
I don't think the bio code is doing a sufficient level of
merging to rip the coalescing out of sba_iommu. Running w/
some debugging turned on and the bio code enabled, I'm
regularly seeing long sg lists get colapsed (99 to 1 is not
terribly uncommon).
Alex
--
Alex Williamson HP Linux & Open Source Lab
next prev parent reply other threads:[~2003-06-23 15:04 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-06-19 17:36 SCSI ERRORS triggered by BIO_VMERGE_BOUNDARY David Mosberger
2003-06-19 20:48 ` Jesse Barnes
2003-06-19 21:47 ` Grant Grundler
2003-06-23 7:11 ` Grant Grundler
2003-06-23 15:04 ` Alex Williamson [this message]
2003-06-23 16:52 ` David Mosberger
2003-06-23 20:24 ` Grant Grundler
2003-06-23 20:41 ` David Mosberger
2003-06-23 22:05 ` Grant Grundler
2003-06-23 22:14 ` David Mosberger
2003-06-24 21:07 ` Grant Grundler
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