Date: Mon, 9 Nov 2009 18:09:10 +0000 (UTC) From: Ken Smith <kensmith@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/dev/sym sym_hipd.c Message-ID: <200911091809.nA9I9Q3G025031@repoman.freebsd.org>
next in thread | raw e-mail | index | archive | help
kensmith 2009-11-09 18:09:10 UTC
FreeBSD src repository
Modified files: (Branch: RELENG_8)
sys/dev/sym sym_hipd.c
Log:
SVN rev 199095 on 2009-11-09 18:09:10Z by kensmith
MFC r198719:
> While certain supported Symbios/LSI SCSI chips (532c896, 53c1000, 53c1010)
> do support 64bit addresses, the current SCRIPTS code supports only 32bit
> addresses causing data corruption for buffer addresses >4GB. This problem
> affects 64bit machines with more than 4GB RAM or amd64 with 4GB and
> memory hole remapping.
> Work-around this problem with a bus_dma tag that requests bounce-buffers
> for addresses >4GB. This causes some overhead, but given the maximum SCSI
> bus speed of 160MB/s compared, the effect should hardly be noticeable.
> The problem was reported by Mike Watters (mike at mwatters net) who also
> verified that this fix cures the problem.
>
> Since this change is a NOOP on systems with less than 4GB RAM and fixes
> data corruption (in RAM and on disk) on systems with more than 4GB, I hope
> that this change is accepted for 8.0.
Requested by: Stefan Esser (se at freebsd dot org)[1]
Reviewed by: jhb, scottl
[1] Stefan requested this be part of 8.0 but has been unavailable to do
the MFC since submitting the request. We want to get 8.0-RC3 started
so I'm doing the merges with re@ hat on.
Revision Changes Path
1.72.2.2 +1 -1 src/sys/dev/sym/sym_hipd.c
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200911091809.nA9I9Q3G025031>