Re: mpt Serious performance issues

[Stephan <stephanwib%googlemail.com@localhost>]

Hm, as a workaround, I managed to destroy the RAID-set and acessed the
disks directly.

Does anybody have an idea what causes the poor perfomance on hardware
RAID-sets?

I saw the same with the ciss driver which is as slow on 5.1 but very
fast on 5.99.39 (up to 180MB/s write speed).

The changelog tells about "tagged queueing"...

Regards,

Stephan

2010/11/29 Manuel Bouyer <bouyer%antioche.eu.org@localhost>:
> On Mon, Nov 29, 2010 at 09:05:16AM +0100, Stephan wrote:
>> Hi,
>>
>> this is the reading result with 64k blocks after rebooting:
>>
>>
>> # dd if=myfile of=/dev/null bs=64k
>> 5636+0 records in
>> 5636+0 records out
>> 369360896 bytes transferred in 57.104 secs (6468214 bytes/sec)
>>
>>
>> The volume is RAID-1. I wonder why the NetBSD driver is not in sync
>> with the FreeBSD one as that appers to be actively maintained.
>
> because the kernel interfaces are completely different; porting require
> a substancial effort, and hardware for tests.
>
> --
> Manuel Bouyer <bouyer%antioche.eu.org@localhost>
>     NetBSD: 26 ans d'experience feront toujours la difference
> --
>