linux-kernel - Re: [Patch 00/15] Reduce tracing payload size.

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Message-ID: <20101206164150.GD24977@basil.fritz.box>
Date:	Mon, 6 Dec 2010 17:41:50 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc:	Andi Kleen <andi@...stfloor.org>, Ted Ts'o <tytso@....edu>,
	David Sharp <dhsharp@...gle.com>, rostedt@...dmis.org,
	linux-kernel@...r.kernel.org, mrubin@...gle.com
Subject: Re: [Patch 00/15] Reduce tracing payload size.

> That is true for the decompression step but not for the compression
> one, which takes more than 10 memcpys().

That's a good point. At 10x it's definitely too slow. Too bad, would have been too easy.

I guess one could still consider some very cheap data specific delta compressions 
(I assume there's a lot of redundancy in a tracing stream with similar events
occurring in a row or nearby) I used this technique successfully with large log files 
in the past and overall moving less data around ends up being cheaper.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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