From: Christoph Hellwig <hch@infradead.org>
To: Dave Chinner <david@fromorbit.com>
Cc: Anju T Sudhakar <anju@linux.vnet.ibm.com>,
hch@infradead.org, darrick.wong@oracle.com,
linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org, willy@infradead.org,
riteshh@linux.ibm.com
Subject: Re: [PATCH] iomap: Fix the write_count in iomap_add_to_ioend().
Date: Fri, 21 Aug 2020 07:01:39 +0100 [thread overview]
Message-ID: <20200821060139.GB31091@infradead.org> (raw)
In-Reply-To: <20200820231140.GE7941@dread.disaster.area>
On Fri, Aug 21, 2020 at 09:11:40AM +1000, Dave Chinner wrote:
> On Wed, Aug 19, 2020 at 03:58:41PM +0530, Anju T Sudhakar wrote:
> > From: Ritesh Harjani <riteshh@linux.ibm.com>
> >
> > __bio_try_merge_page() may return same_page = 1 and merged = 0.
> > This could happen when bio->bi_iter.bi_size + len > UINT_MAX.
>
> Ummm, silly question, but exactly how are we getting a bio that
> large in ->writepages getting built? Even with 64kB pages, that's a
> bio with 2^16 pages attached to it. We shouldn't be building single
> bios in writeback that large - what storage hardware is allowing
> such huge bios to be built? (i.e. can you dump all the values in
> /sys/block/<dev>/queue/* for that device for us?)
NVMe controller should not have a problem with such huge I/O,
especially if they support SGLs (extent based I/O :)) instead of the
default dumb PRP scheme. Higher end SCSI controller should also have
huge limits.
next prev parent reply other threads:[~2020-08-21 6:01 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-19 10:28 [PATCH] iomap: Fix the write_count in iomap_add_to_ioend() Anju T Sudhakar
2020-08-20 23:11 ` Dave Chinner
2020-08-21 4:45 ` Ritesh Harjani
2020-08-21 6:00 ` Christoph Hellwig
2020-08-21 9:09 ` Ritesh Harjani
2020-08-21 21:53 ` Dave Chinner
2020-08-22 13:13 ` Christoph Hellwig
2020-08-24 14:28 ` Brian Foster
2020-08-24 15:04 ` Christoph Hellwig
2020-08-24 15:48 ` Brian Foster
2020-08-25 0:42 ` Dave Chinner
2020-08-25 14:49 ` Brian Foster
2020-08-31 4:01 ` Ming Lei
2020-08-31 14:35 ` Brian Foster
2020-09-16 0:12 ` Darrick J. Wong
2020-09-16 8:45 ` Christoph Hellwig
2020-09-16 13:07 ` Brian Foster
2020-09-17 8:04 ` Christoph Hellwig
2020-09-17 10:42 ` Brian Foster
2020-09-17 14:48 ` Christoph Hellwig
2020-09-17 21:33 ` Darrick J. Wong
2020-09-17 23:13 ` Ming Lei
2020-08-21 6:01 ` Christoph Hellwig [this message]
2020-08-21 6:07 ` Christoph Hellwig
2020-08-21 8:53 ` Ritesh Harjani
2020-08-21 14:49 ` Jens Axboe
2020-08-21 13:31 ` Matthew Wilcox
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