linux-kernel - Re: [PATCH] nbd: increase default and max request sizes

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Message-Id: <20130411153402.12cfa2ad0c4501be1331e748@linux-foundation.org>
Date:	Thu, 11 Apr 2013 15:34:02 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Paul Clements <paul.clements@...eleye.com>
Cc:	<linux-kernel@...r.kernel.org>, <belczyk@....krakow.pl>
Subject: Re: [PATCH] nbd: increase default and max request sizes

On Tue,  2 Apr 2013 15:41:20 -0400 (EDT) Paul Clements <paul.clements@...eleye.com> wrote:

> This patch raises the default max request size for nbd to 128KB (from 127KB)
> to get it 4KB aligned. This patch also allows the max request size to be
> increased (via /sys/block/nbd<x>/queue/max_sectors_kb) to 32MB.
> 
> The patch makes nbd network traffic more efficient by:
> - reducing request fragmentation (4KB alignment)
> - reducing the number of requests (fewer round trips, less network overhead)
> 
> Especially in high latency networks, larger request size can make a dramatic
> difference in performance.
> 
> From: Michal Belczyk <belczyk@....krakow.pl>
> Signed-off-by: Paul Clements <paul.clements@...eleye.com>

This is a bit odd.

- The author's "From:" line shouild appear right at the start of the
  changelog.

- Michal's Signed-off-by: is absent.  Is one available?

Thanks.
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