From: David Sterba <dsterba@suse.cz>
To: shngmao@gmail.com
Cc: linux-btrfs@vger.kernel.org
Subject: Re: [PATCH] btrfs-progs: align btrfs receive buffer to enable fast CRC
Date: Wed, 6 Jan 2021 13:16:35 +0100 [thread overview]
Message-ID: <20210106121635.GR6430@twin.jikos.cz> (raw)
In-Reply-To: <20201226214606.49241-1-shngmao@gmail.com>
On Sat, Dec 26, 2020 at 02:46:06PM -0700, shngmao@gmail.com wrote:
> From: Sheng Mao <shngmao@gmail.com>
>
> To use optimized CRC implemention, the input buffer must be
> unsigned long aligned. btrfs receive calculates checksum based on
> read_buf, including btrfs_cmd_header (with zero-ed CRC field)
> and command content. GCC attribute is added to both struct
> btrfs_send_stream and read_buf to make sure read_buf is allocated
> with proper alignment.
>
> Issue: #324
The issue has a lot of interesting debugging and performance information
so I'd put something to the changelog as well.
The alignment fixup sounds correct, though I'd push it a bit further and
move read_buf to the beginning of the structure and align the whole
structure to 64 bytes, as this is the common cache line size. This could
potentially help too with memcpy.
next prev parent reply other threads:[~2021-01-06 12:19 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-26 21:46 [PATCH] btrfs-progs: align btrfs receive buffer to enable fast CRC shngmao
2021-01-03 2:53 ` Wang Yugui
2021-01-06 12:16 ` David Sterba [this message]
2021-01-08 1:58 ` Sheng Mao
2021-01-14 18:37 ` David Sterba
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