From: Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
To: Bart Van Assche <bart.vanassche-XdAiOPVOjttBDgjK7y7TUQ@public.gmane.org>
Cc: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>,
"linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"linux-scsi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-scsi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
linux-block-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH 2/2] IB/iser: set max_segment_size
Date: Tue, 12 Apr 2016 11:43:09 -0700 [thread overview]
Message-ID: <20160412184309.GA3333@infradead.org> (raw)
In-Reply-To: <570D3AE0.4040104-XdAiOPVOjttBDgjK7y7TUQ@public.gmane.org>
On Tue, Apr 12, 2016 at 11:13:52AM -0700, Bart Van Assche wrote:
> >That's what NVMe does, but I don't think it's a good idea. Because
> >of the unaligned start into the page this means you have to set the limit
> >to one lower than the actual hardware limit.
>
> I think this means that there is a mismatch between the current block layer
> limits and what NVMe / RDMA drivers need ...
If we tell the block layer that we can only handle page sized comments
using max_segent_size it should do the right thing.
Now one thing that might be useful is to force the max_segent_size
when setting the virt boundary, as they seem to be closely related.
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next prev parent reply other threads:[~2016-04-12 18:43 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-12 14:13 fix large I/O regression with iSER in 4.4+ V2 Christoph Hellwig
[not found] ` <1460470405-11673-1-git-send-email-hch-jcswGhMUV9g@public.gmane.org>
2016-04-12 14:13 ` [PATCH 1/2] scsi: add a max_segment_size limitation to struct Scsi_Host Christoph Hellwig
2016-04-12 15:19 ` Bart Van Assche
2016-04-12 15:37 ` Laurence Oberman
[not found] ` <1460470405-11673-2-git-send-email-hch-jcswGhMUV9g@public.gmane.org>
2016-04-13 9:39 ` Sagi Grimberg
2016-04-12 14:13 ` [PATCH 2/2] IB/iser: set max_segment_size Christoph Hellwig
2016-04-12 15:34 ` Bart Van Assche
2016-04-12 16:51 ` Christoph Hellwig
[not found] ` <20160412165130.GB9568-jcswGhMUV9g@public.gmane.org>
2016-04-12 18:13 ` Bart Van Assche
[not found] ` <570D3AE0.4040104-XdAiOPVOjttBDgjK7y7TUQ@public.gmane.org>
2016-04-12 18:43 ` Christoph Hellwig [this message]
[not found] ` <20160412184309.GA3333-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2016-04-13 14:07 ` Christoph Hellwig
2016-04-13 9:39 ` Sagi Grimberg
[not found] ` <1460470405-11673-3-git-send-email-hch-jcswGhMUV9g@public.gmane.org>
2016-04-28 7:40 ` Or Gerlitz
-- strict thread matches above, loose matches on Subject: below --
2016-04-11 22:47 fix large I/O regression with iSER in 4.4+ Christoph Hellwig
2016-04-11 22:47 ` [PATCH 2/2] IB/iser: set max_segment_size Christoph Hellwig
2016-04-12 10:48 ` Sagi Grimberg
[not found] ` <570CD26E.70502-NQWnxTmZq1alnMjI0IkVqw@public.gmane.org>
2016-04-12 14:27 ` James Bottomley
[not found] ` <1460471256.2338.5.camel-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org>
2016-04-12 15:27 ` Christoph Hellwig
2016-04-13 8:01 ` Sagi Grimberg
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