From: Joe Thornber <thornber@redhat.com>
To: Lars Marowsky-Bree <lmb@suse.de>
Cc: Joe Thornber <thornber@redhat.com>,
Linux Mailing List <linux-kernel@vger.kernel.org>,
axboe@suse.de
Subject: Re: dm core patches
Date: Fri, 13 Feb 2004 15:39:36 +0000 [thread overview]
Message-ID: <20040213153936.GF15736@reti> (raw)
In-Reply-To: <20040213151213.GR21298@marowsky-bree.de>
On Fri, Feb 13, 2004 at 04:12:14PM +0100, Lars Marowsky-Bree wrote:
> On 2004-02-12T20:13:40,
> Joe Thornber <thornber@redhat.com> said:
>
> > I think the main concern now is over the testing of paths. Sending an
> > io down an inactive path can be very expensive for some hardware
> > configurations. So I'm considering changing a couple of things:
> >
> > - Only ever send io to 1 priority group at a time (even test ios).
> > To test the lower priority groups we'd have to periodically switch to
> > them and use them for a bit for both test io and proper io.
>
> You are missing the obvious answer:
>
> - Periodically checking paths is a user-space issue and doesn't belong
> into the kernel. User-space gets to handle this policy.
Yes, that is obvious, I had wanted to do failback automatically. But
pushing it to userland does allow people to write hardware specific
tests. I'll try it and see what people think.
Thanks,
- Joe
next prev parent reply other threads:[~2004-02-13 15:38 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-02-10 16:35 dm core patches Joe Thornber
2004-02-10 16:57 ` [Patch 1/10] dm: Export dm_vcalloc() Joe Thornber
2004-02-10 16:59 ` [Patch 2/10] dm: Lift to_bytes() and to_sectors() into dm.h Joe Thornber
2004-02-10 16:59 ` [Patch 3/10] dm: Get rid of struct dm_deferred_io in dm.c Joe Thornber
2004-02-10 17:33 ` Christophe Saout
2004-02-10 17:00 ` [Patch 4/10] dm: Maintain ordering when deferring bios Joe Thornber
2004-02-10 17:00 ` [Patch 5/10] dm: Tidy up the error path for alloc_dev() Joe Thornber
2004-02-10 17:01 ` [Patch 6/10] dm: block size bug with 64 bit devs Joe Thornber
2004-02-10 17:01 ` [Patch 7/10] dm: Correct GFP flag in dm_table_create() Joe Thornber
2004-02-10 17:02 ` [Patch 8/10] dm: Zero size target sanity check Joe Thornber
2004-02-10 17:02 ` [Patch 9/10] dm: Remove redundant spin lock in dec_pending() Joe Thornber
2004-02-10 17:03 ` [Patch 10/10] dm: drop BIO_SEG_VALID bit Joe Thornber
2004-02-11 10:16 ` dm core patches Lars Marowsky-Bree
2004-02-11 10:35 ` Joe Thornber
2004-02-12 18:51 ` Lars Marowsky-Bree
2004-02-12 20:13 ` Joe Thornber
2004-02-13 15:12 ` Lars Marowsky-Bree
2004-02-13 15:39 ` Joe Thornber [this message]
2004-02-13 16:08 ` Arjan van de Ven
2004-02-16 8:19 ` Lars Marowsky-Bree
2004-02-16 9:35 ` Arjan van de Ven
2004-02-13 23:46 ` Mike Anderson
2004-02-16 12:17 ` Heinz Mauelshagen
2004-02-13 16:03 ` Jens Axboe
-- strict thread matches above, loose matches on Subject: below --
2004-02-13 16:44 James Bottomley
2004-02-16 8:22 ` Lars Marowsky-Bree
2004-02-16 16:57 ` Jens Axboe
2004-02-16 17:04 ` James Bottomley
2004-02-19 0:26 ` Mike Christie
2004-02-19 3:40 ` Jeff Garzik
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