linux-kernel - Re: [PATCH v10 0/1] bio: limit bio max size

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Date:   Thu, 13 May 2021 12:23:17 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Changheun Lee <nanich.lee@...sung.com>
Cc:     alex_y_xu@...oo.ca, yi.zhang@...hat.com, jaegeuk@...nel.org,
        bgoncalv@...hat.com, Johannes.Thumshirn@....com,
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        damien.lemoal@....com, gregkh@...uxfoundation.org,
        hch@...radead.org, linux-block@...r.kernel.org,
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        patchwork-bot@...nel.org, tj@...nel.org, tom.leiming@...il.com,
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Subject: Re: [PATCH v10 0/1] bio: limit bio max size

FYI, I still think this whole limit is a bad idea, and instead we
need to fix the algorithms to not waste time iterating over the bios
again and again in non-optimal ways.  I still haven't seen an answer
if your original latency problems are reproducable with the iomap
direct I/O implementation, and we've also not even started the work on
making some of the common iterators less stupid.