linux-kernel - Re: [RFT][PATCH v7] sata

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Date:	Thu, 12 Jul 2007 19:15:26 -0700 (PDT)
From:	dean gaudet <dean@...tic.org>
To:	Jeff Garzik <jeff@...zik.org>
cc:	linux-ide@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	dave@...dillows.org
Subject: Re: [RFT][PATCH v7] sata_mv: convert to new EH

On Thu, 12 Jul 2007, Jeff Garzik wrote:

> dean gaudet wrote:
> > On Thu, 12 Jul 2007, Jeff Garzik wrote:
> > 
> > > dean gaudet wrote:
> > > > oh very nice... no warnings on boot, and no warnings while i "dd
> > > > if=/dev/sdX
> > > > of=/dev/null" and i'm seeing 74MB/s+ from each disk on this simple read
> > > > test.
> > > > 
> > > > for lack of a better test i started an untar/diff stress test on the
> > > > disks... we'll see how it goes.  (it's based on doug ledford's
> > > > memtest.sh)
> > > Thanks for the testing.  Looks like we might have hit on something good...
> > 
> > yep this does look good.  no problems overnight in the untar/diff/rm
> > workload.  if you've got any other workload you'd like me to throw at it,
> > let me know.  i might be able to scare up a disk or two with errors to check
> > error handling.
> 
> Nothing specific.  I usually just throw various workloads at it, both
> throughput-intensive, seek-intensive, multiple threads at the same time,
> stressing multiple disks at the same time, etc.

yeah the untar/diff/rm workload is seek/thread intensive.


> I presume from your past messages your tests include multiple disks at the
> same time?

yep, 4 disks... i was getting 4x74MB/s with dd read.  unfortunately i 
don't have more disks in the system at this point so i can't test all 8 
ports at full tilt.

each disk had its own XFS filesystem.

> > i tested hotplug just for kicks... no luck there :)  but then you didn't say
> > that would work yet.
> 
> hehehe Well I sorta didn't want to mention it, to avoid clouding the waters
> further.
> 
> In theory, hotplug and hot unplug -should- work, in version 7.  Your report is
> a useful contradiction of that theory, and signals where to poke next.  Since
> all this hacking is a spare-time effort, so promises as to when next I'll poke
> at it.   It might be tomorrow, or a month from now.  Getting "new EH" upstream
> was a big hurdle to overcome, and your testing really helped that along.
> 
> Anyway, something like Version 7 is probably what I will push upstream for
> 2.6.23-rc1.

cool, thanks.

-dean
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