Date: Tue, 1 Jul 2008 19:48:15 +0000 (UTC) From: John Baldwin <jhb@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/dev/mpt mpt_user.c Message-ID: <200807011948.m61JmZU9070376@repoman.freebsd.org>
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jhb 2008-07-01 19:48:15 UTC
FreeBSD src repository
Modified files:
sys/dev/mpt mpt_user.c
Log:
SVN rev 180153 on 2008-07-01 19:48:15Z by jhb
Rework how the mpt_user personality handles buffers for config pages.
Previously we reused the space in the request buffer after the request
header to hold config pages during a transaction. This does not work when
reading large pages however. Also, we were already malloc'ing a buffer to
do a copyin/copyout w/o holding locks that was then copied into/out of the
request buffer. Instead, go ahead and use bus dma to alloc a buffer for
each config page request (and RAID actions that have an associated
ActionSGE). This results in fewer data copies and allows for larger sized
requests. For now the maximum size of a request is arbitrarily limited to
16 MB.
MFC after: 2 weeks
Revision Changes Path
1.2 +105 -67 src/sys/dev/mpt/mpt_user.c
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