Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sat, 22 Mar 2003 02:16:30 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sat, 22 Mar 2003 02:16:29 -0500 Received: from zcars0m9.nortelnetworks.com ([47.129.242.157]:4251 "EHLO zcars0m9.nortelnetworks.com") by vger.kernel.org with ESMTP id ; Sat, 22 Mar 2003 02:16:29 -0500 Message-ID: <3E7C105D.80207@nortelnetworks.com> Date: Sat, 22 Mar 2003 02:27:25 -0500 X-Sybari-Space: 00000000 00000000 00000000 From: Chris Friesen User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.8) Gecko/20020204 X-Accept-Language: en-us MIME-Version: 1.0 To: linux-kernel@vger.kernel.org Subject: increased unix socket latency from 2.4 to 2.5 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1058 Lines: 31 I have a small test app that simply embeds a timestamp in a message and sends it to a receiver, who timestamps the receipt and figures out the message delay. The packet being sent is 40036 bytes long. In 2.4.20 with default priorities the latency was 302 usec. In 2.5.63 with default priorities it went up to 841 usec. In 2.5.65 with default priorities it has gone up to 1210 usec. If I set the receiver to a priority of -20, it drops down to about 1037 usec. Processor is Duron, all kernels built for K7 using gcc 3.2. Anyone know what's going on here? Chris -- Chris Friesen | MailStop: 043/33/F10 Nortel Networks | work: (613) 765-0557 3500 Carling Avenue | fax: (613) 765-2986 Nepean, ON K2H 8E9 Canada | email: cfriesen@nortelnetworks.com - 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/