Ok, but i installed Linux (Debian 6) and there is no performance degradation.

I will install NetBSD too, and i will do a test.

The commit does not turn on the cache, it enable tagged queing if i
understand it well.


2012/5/29 Jonathan Gray <j...@jsg.id.au>:
> I don't think that commit will fix the problem.
> HP shouldn't sell machines without the battery, but they do.
> From memory the firmware on the raid controller has no way
> of turning on caching without the battery being present.
> On Tue, May 29, 2012 at 11:30:34AM +0200, csszep wrote:
>> Hi Misc!
>> We have some older HP Dl360, Dl380 G4 machines with Smart Array 6i
>> controllores w/o battery backed cache.
>> The disk performance in this case is really poor, for examle the
>> disklabel operation on a 72GB disk lasted for about 5 mins.
>> I found a commit in a NetBSD ciss driver (which is a port of OpenBSD
>> driver), that solve the problem i think:
>> http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/dev/ic/ciss.c?rev=1.23&content-type=text/x-cvsweb-markup&only_with_tag=MAIN
>> The problem is, that the NetBSD scsi midlayer is very different from
>> the OpenBSD, so is it possible to integrate this patch? My C and
>> OpenBSD internals knowledge is not enough for this task.
>> PS: Yes i know, my english is terrible.
>> thx
>> csszep

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