Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753794AbZDDOey (ORCPT ); Sat, 4 Apr 2009 10:34:54 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754017AbZDDOeo (ORCPT ); Sat, 4 Apr 2009 10:34:44 -0400 Received: from mu-out-0910.google.com ([209.85.134.184]:29096 "EHLO mu-out-0910.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753258AbZDDOen (ORCPT ); Sat, 4 Apr 2009 10:34:43 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=subject:from:to:cc:in-reply-to:references:content-type:date :message-id:mime-version:x-mailer:content-transfer-encoding; b=wvnxTufCCukSPgWtjKzCeXKID/G8ZdsKS1SbGkLjGYbuXZAwVhA/5KRmZjHJkr01gp EQyiUhbsvyatfRreQIjSyNuOl4UBK1y3Ct5QnBroXkjdO4GriSHyNLXSGz8RgUDZChbY 8wDQ0TntwnsBoX9b62wBUVZ8KHlV/BDrK9pJc= Subject: Re: [PATCH 1/2] lib: add fast lzo decompressor From: Andreas Robinson To: "H. Peter Anvin" Cc: John Stoffel , Alain Knaff , linux-kernel@vger.kernel.org In-Reply-To: <49D65700.5060202@zytor.com> References: <1238593252-3435-1-git-send-email-andr345@gmail.com> <1238593252-3435-2-git-send-email-andr345@gmail.com> <49D3927A.2050406@zytor.com> <1238613730.10514.35.camel@andreas-desktop> <18900.52255.798522.393088@stoffel.org> <1238752196.8118.185.camel@andreas-desktop> <49D65700.5060202@zytor.com> Content-Type: text/plain Date: Sat, 04 Apr 2009 16:34:36 +0200 Message-Id: <1238855676.18423.32.camel@andreas-desktop> Mime-Version: 1.0 X-Mailer: Evolution 2.24.3 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 903 Lines: 26 Hi, after enabling checksumming (adler32) and adding an overrun check, based on your suggestions and objections, the performance advantage of LZO on the Eee 901 dropped to 67 ms with the fast, and 54 ms with the safe decompressor. Apparently almost half of the speed boost came from skipping the checksumming. At this point I don't think this idea is worth pursuing further, when LZO is so close to gzip in performance after all. But I want thank you for discussing this topic and taking my patch submission seriously. I hope I did not waste too much of your time and that I will be able to contribute something more useful next time. Thanks, Andreas -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/