linux-kernel - Re: [PATCH v2] block: respect virtual boundary mask in bvecs

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Message-ID: <b557400b-4ef9-481f-ac0b-b80545e84a2f@fb.com>
Date:   Wed, 7 Nov 2018 20:04:58 +0000
From:   Jens Axboe <axboe@...com>
To:     Johannes Thumshirn <jthumshirn@...e.de>
CC:     Linux Block Layer Mailinglist <linux-block@...r.kernel.org>,
        "Linux Kernel Mailinglist" <linux-kernel@...r.kernel.org>,
        Jan Kara <jack@...e.cz>, Sagi Grimberg <sagi@...mberg.me>,
        Bart Van Assche <bvanassche@....org>,
        Ming Lei <ming.lei@...hat.com>
Subject: Re: [PATCH v2] block: respect virtual boundary mask in bvecs

On 11/7/18 6:58 AM, Johannes Thumshirn wrote:
> With drivers that are settting a virtual boundary constrain, we are
> seeing a lot of bio splitting and smaller I/Os being submitted to the
> driver.
> 
> This happens because the bio gap detection code does not account cases
> where PAGE_SIZE - 1 is bigger than queue_virt_boundary() and thus will
> split the bio unnecessarily.

Thanks, applied.

-- 
Jens Axboe