From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on dcvr.yhbt.net X-Spam-Level: X-Spam-ASN: AS31976 209.132.176.0/21 X-Spam-Status: No, score=-3.5 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MSGID_FROM_MTA_HEADER,RP_MATCHES_RCVD shortcircuit=no autolearn=ham autolearn_force=no version=3.4.0 From: "H. Peter Anvin" Subject: Re: kernel.org mirroring (Re: [GIT PULL] MMC update) Date: Sun, 10 Dec 2006 13:01:50 -0800 Message-ID: <457C75BE.1010805@zytor.com> References: <200612101402.51363.jnareb@gmail.com> <457C0F8F.7030504@garzik.org> <200612102011.52589.jnareb@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit NNTP-Posting-Date: Sun, 10 Dec 2006 21:02:22 +0000 (UTC) Cc: Jakub Narebski , Jeff Garzik , Martin Langhoff , Git Mailing List , Rogan Dawes , Kernel Org Admin Return-path: Envelope-to: gcvg-git@gmane.org User-Agent: Thunderbird 1.5.0.8 (X11/20061107) In-Reply-To: X-Virus-Scanned: ClamAV 0.88.6/2313/Sun Dec 10 07:01:32 2006 on terminus.zytor.com X-Virus-Status: Clean Precedence: bulk X-Mailing-List: git@vger.kernel.org Archived-At: Received: from vger.kernel.org ([209.132.176.167]) by dough.gmane.org with esmtp (Exim 4.50) id 1GtVoQ-00026D-4X for gcvg-git@gmane.org; Sun, 10 Dec 2006 22:02:18 +0100 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762603AbWLJVCP (ORCPT ); Sun, 10 Dec 2006 16:02:15 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1762599AbWLJVCP (ORCPT ); Sun, 10 Dec 2006 16:02:15 -0500 Received: from terminus.zytor.com ([192.83.249.54]:58764 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1762603AbWLJVCO (ORCPT ); Sun, 10 Dec 2006 16:02:14 -0500 Received: from [172.27.0.16] (c-67-180-238-27.hsd1.ca.comcast.net [67.180.238.27]) (authenticated bits=0) by terminus.zytor.com (8.13.8/8.13.7) with ESMTP id kBAL1oWa004482 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Sun, 10 Dec 2006 13:01:52 -0800 To: Linus Torvalds Sender: git-owner@vger.kernel.org Linus Torvalds wrote: > > Now, hopefully some of it will be in the disk cache, but when the > mirroring happens, it will basically blow the disk caches away totally > (when using the "--checksum" option), and then you literally have tens of > seconds to generate that one top-level page. > If that was the only time that happened, it would be a non-issue, since that only happens once every 96 hours. However, the problem is that we now have lots of large datasets that blow out the caches on a much more frequent basis.