From: Christoph Hellwig <hch@lst.de>
To: Yu Kuai <yukuai@kernel.org>
Cc: Coly Li <i@coly.li>, Christoph Hellwig <hch@lst.de>,
Coly Li <colyli@kernel.org>,
linux-raid@vger.kernel.org, linux-block@vger.kernel.org,
Yu Kuai <yukuai3@huawei.com>, Xiao Ni <xni@redhat.com>,
Hannes Reinecke <hare@suse.de>, Martin Wilck <mwilck@suse.com>,
Keith Busch <kbusch@kernel.org>
Subject: Re: [RFC PATCH] md: split bio by io_opt size in md_submit_bio()
Date: Thu, 17 Jul 2025 06:52:10 +0200 [thread overview]
Message-ID: <20250717045210.GA27227@lst.de> (raw)
In-Reply-To: <284433c9-c11d-401f-8015-41faa9d0fde1@kernel.org>
On Thu, Jul 17, 2025 at 12:29:27AM +0800, Yu Kuai wrote:
>> If opt_io_size is (chunk_size * data_disks), setting new max_hw_sectors as rounddown(current max_hw_sectors, opt_io_size) is good idea.
>
> I think round down max_hw_sectors to io_opt(chunk_size * data_disks) will
> really
> make things much easier, perhaps Christoph means this way. All you need to
> do is to
> handle not aligned bio and split that part, and for aligned bio fall back
> to use
> bio_split_to_limits().
If the raid5 code can handle multiple stripes per I/O, than you
just need to round it down, yes. I assumed it could only handle
a single full or partial stripe at a time, but I guess I was wrong.
next prev parent reply other threads:[~2025-07-17 4:52 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-15 18:02 [RFC PATCH] md: split bio by io_opt size in md_submit_bio() colyli
2025-07-16 1:46 ` Yu Kuai
2025-07-16 6:58 ` Yu Kuai
2025-07-16 8:50 ` Coly Li
2025-07-16 9:30 ` Yu Kuai
2025-07-16 11:37 ` Christoph Hellwig
[not found] ` <437E98DD-7D64-49BF-9F2C-04CB0A142A88@coly.li>
2025-07-16 11:41 ` Christoph Hellwig
2025-07-16 11:44 ` Coly Li
2025-07-16 11:45 ` Christoph Hellwig
2025-07-16 12:10 ` Coly Li
2025-07-16 12:14 ` Christoph Hellwig
[not found] ` <DE36C995-4014-44DC-A998-1C4FF9AFD7F9@coly.li>
2025-07-16 12:17 ` Christoph Hellwig
2025-07-16 12:23 ` Coly Li
2025-07-16 16:29 ` Yu Kuai
2025-07-17 4:52 ` Christoph Hellwig [this message]
2025-07-17 15:19 ` Coly Li
-- strict thread matches above, loose matches on Subject: below --
2025-07-15 17:59 colyli
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