From: Chaitanya Kulkarni <chaitanyak@nvidia.com>
To: Jens Axboe <axboe@kernel.dk>,
"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>
Cc: "joshi.k@samsung.com" <joshi.k@samsung.com>,
"kbusch@kernel.org" <kbusch@kernel.org>
Subject: Re: [PATCH 2/3] block: enable bio caching use for passthru IO
Date: Sun, 7 Aug 2022 09:27:57 +0000 [thread overview]
Message-ID: <d8467ed6-14e1-3018-e2e6-6cd1137742d0@nvidia.com> (raw)
In-Reply-To: <20220806152004.382170-3-axboe@kernel.dk>
On 8/6/22 08:20, 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.
>
> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Looks good.
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
-ck
next prev parent reply other threads:[~2022-08-07 9:28 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 [this message]
2022-08-07 18:08 ` Kanchan Joshi
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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