Re: [PATCH] deadline io scheduler

[Thomas Tonino <ttonino@users.sf.net>]

Michael Clark wrote:

> Although last time i tried Matt Jabob's driver, it locked up
> after 30 seconds of running bonnie. At least with Qlogic's
> driver I can run bonnie and cerberus continuously for 2 weeks
> with no problems (although this may have been because
> Matt's driver ignored the command queue throttle set in the
> qlogic cards BIOS).

My excerience with a JBOD box is the in kernel driver locking up with the "no 
handle slots, this should not happen" message in half an hour running a 4 MB/sec 
write load.

Then tried the feral.com driver. That one was stable with the same load. Ran 
that one for a month or two.

Then came along the highio patch in -AA. Made me want to switch to the in kernel 
qlogic driver again. This was a good time to try a patch by Andrew Patterson, 
AFAIR upping the number of slots to 255 and fixing the calculations around them. 
This has been running without problems for a few months now.

The patch has been posted to the list. It can be found at 
http://groups.google.com/groups?selm=linux.scsi.1019759258.2413.1.camel%40lvadp.fc.hp.com

> The qlogic HBAs are a real problem in choosing which driver
> to use out of:
> 
> in kernel qlogicfc
> Qlogic's qla2x00 v4.x, v5.x, v6.x
> Matthew Jacob's isp_mod

I never tried Qlogic's driver, probably because of all the versions floating around.


Thomas