From: Kanchan Joshi <joshi.k@samsung.com>
To: Jens Axboe <axboe@kernel.dk>
Cc: linux-block@vger.kernel.org, kbusch@kernel.org
Subject: Re: [PATCH 2/3] block: enable bio caching use for passthru IO
Date: Sun, 7 Aug 2022 23:38:55 +0530 [thread overview]
Message-ID: <20220807180855.GA30655@test-zns> (raw)
In-Reply-To: <20220806152004.382170-3-axboe@kernel.dk>
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On Sat, Aug 06, 2022 at 09:20:03AM -0600, Jens Axboe wrote:
>bdev based polled O_DIRECT is currently quite a bit faster than
>passthru on the same device, and one of the reaons is that we're not
>able to use the bio caching for passthru IO.
>
>If REQ_POLLED is set on the request, use the fs bio set for grabbing a
>bio from the caches, if available. This saves 5-6% of CPU over head
>for polled passthru IO.
For passthru path, bio is always freed in the task-context (and not in
irq) so must this be tied to polled-io only?
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next prev parent reply other threads:[~2022-08-07 18:18 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-06 15:20 [PATCHSET 0/3] passthru block optimizations Jens Axboe
2022-08-06 15:20 ` [PATCH 1/3] block: shrink rq_map_data a bit Jens Axboe
2022-08-07 9:26 ` Chaitanya Kulkarni
2022-08-06 15:20 ` [PATCH 2/3] block: enable bio caching use for passthru IO Jens Axboe
2022-08-07 9:27 ` Chaitanya Kulkarni
2022-08-07 18:08 ` Kanchan Joshi [this message]
2022-08-07 18:45 ` Jens Axboe
2022-08-06 15:20 ` [PATCH 3/3] block: use on-stack page vec for <= UIO_FASTIOV Jens Axboe
2022-08-07 9:30 ` Chaitanya Kulkarni
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