From: Christoph Hellwig <hch@infradead.org>
To: Ritesh Harjani <riteshh@linux.ibm.com>
Cc: Dave Chinner <david@fromorbit.com>,
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
Subject: Re: [PATCH] iomap: Fix the write_count in iomap_add_to_ioend().
Date: Fri, 21 Aug 2020 07:00:25 +0100 [thread overview]
Message-ID: <20200821060025.GA31091@infradead.org> (raw)
In-Reply-To: <20200821044533.BBFD1A405F@d06av23.portsmouth.uk.ibm.com>
On Fri, Aug 21, 2020 at 10:15:33AM +0530, Ritesh Harjani wrote:
> Please correct me here, but as I see, bio has only these two limits
> which it checks for adding page to bio. It doesn't check for limits
> of /sys/block/<dev>/queue/* no? I guess then it could be checked
> by block layer below b4 submitting the bio?
The bio does not, but the blk-mq code will split the bios when mapping
it to requests, take a look at blk_mq_submit_bio and __blk_queue_split.
But while the default limits are quite low, they can be increased
siginificantly, which tends to help with performance and is often
also done by scripts shipped by the distributions.
> This issue was first observed while running a fio run on a system with
> huge memory. But then here is an easy way we figured out to trigger the
> issue almost everytime with loop device on my VM setup. I have provided
> all the details on this below.
Can you wire this up for xfstests?
next prev parent reply other threads:[~2020-08-21 6:00 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 [this message]
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
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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