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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/