From: Mike Snitzer <snitzer@redhat.com>
To: Jens Axboe <axboe@kernel.dk>
Cc: Christoph Hellwig <hch@infradead.org>,
martin.petersen@oracle.com, mst@redhat.com,
rusty@rustcorp.com.au, linux-kernel@vger.kernel.org,
qemu-devel@nongnu.org, dm-devel@redhat.com,
Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: virtio_blk: fix defaults for max_hw_sectors and max_segment_size
Date: Wed, 26 Nov 2014 16:51:08 -0500 [thread overview]
Message-ID: <20141126215108.GA32077@redhat.com> (raw)
In-Reply-To: <54763DEC.3050207@kernel.dk>
On Wed, Nov 26 2014 at 3:54pm -0500,
Jens Axboe <axboe@kernel.dk> wrote:
> On 11/26/2014 01:51 PM, Mike Snitzer wrote:
> > On Wed, Nov 26 2014 at 2:48pm -0500,
> > Jens Axboe <axboe@kernel.dk> wrote:
> >
> >>
> >> That code isn't even in mainline, as far as I can tell...
> >
> > Right, it is old RHEL6 code.
> >
> > But I've yet to determine what changed upstream that enables this to
> > "just work" with a really large max_sectors (I haven't been looking
> > either).
>
> Kind of hard for the rest of us to say, since it's triggering a BUG in
> code we don't have :-)
I never asked you or others to weigh in on old RHEL6 code. Once I
realized upstream worked even if max_sectors is _really_ high I said
"sorry for the noise".
But while you're here, I wouldn't mind getting your take on virtio-blk
setting max_hw_sectors to -1U.
As I said in my original reply to mst: it only makes sense to set a
really high initial upper bound like that in a driver if that driver
goes on to stack an underlying device's limit.
next prev parent reply other threads:[~2014-11-26 21:51 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-20 19:00 [PATCH] virtio_blk: fix defaults for max_hw_sectors and max_segment_size Mike Snitzer
2014-11-20 20:30 ` Michael S. Tsirkin
2014-11-20 21:15 ` Mike Snitzer
2014-11-26 5:58 ` Rusty Russell
2014-11-26 14:10 ` Mike Snitzer
2014-11-21 1:59 ` Mike Snitzer
2014-11-21 2:11 ` [PATCH v2] " Mike Snitzer
2014-11-21 9:54 ` [PATCH] " Christoph Hellwig
2014-11-21 15:49 ` Mike Snitzer
2014-11-26 19:48 ` Jens Axboe
2014-11-26 20:51 ` Mike Snitzer
2014-11-26 20:54 ` Jens Axboe
2014-11-26 21:51 ` Mike Snitzer [this message]
2014-11-26 21:53 ` Jens Axboe
2014-11-26 23:00 ` Mike Snitzer
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