Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756030AbXJ3Q7S (ORCPT ); Tue, 30 Oct 2007 12:59:18 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752395AbXJ3Q7I (ORCPT ); Tue, 30 Oct 2007 12:59:08 -0400 Received: from wa-out-1112.google.com ([209.85.146.177]:34056 "EHLO wa-out-1112.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752459AbXJ3Q7H (ORCPT ); Tue, 30 Oct 2007 12:59:07 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:mime-version:content-type:content-transfer-encoding:content-disposition; b=gZVpUq/pVJ0nncQKLtaleRJK4UqHyXdZfMovdiCNud++tIecL+9uLbXPyhiiD7M2whg+21EFBMTYflMl3lXvFTJN7ONj5q1eNyQZa27DbBmuNHYjVy6qxb3DxR23xYu6DD/Z4tTedJ3+33zUZoKEID/+alKR8GUDuL/JrjIAtqo= Message-ID: Date: Tue, 30 Oct 2007 18:59:03 +0200 From: "saeed bishara" To: linux-kernel@vger.kernel.org Subject: system stops sending IOs for long time MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1980 Lines: 34 Hi, I have a performance issue with my system that runs samba server, once in a while (6 seconds) I see that the throughput falls almost to to zero when doing read for large file. I'm running kernel 2.6.22.10. I don't see this issue when using kernel 2.6.12. when observing the activity leds on my sata controller, I see that it get off for about 1 second meaning no commands sent to the HDD for that long time. I used the blktrace in order to have a look into the IOs, and found that the system really stops sending commands for long periods, here is the section of the blkparse that shows this problem: 8,2 0 12747 5.550000000 328 D R 108068834 + 512 [smbd] 8,2 0 12748 5.550000000 328 D R 108069346 + 512 [smbd] 8,2 0 12749 5.550000000 328 D R 108069858 + 512 [smbd] 8,2 0 12750 5.550000000 328 D R 108070370 + 512 [smbd] 8,2 0 12751 5.550000000 328 U N [smbd] 5 8,2 0 12752 5.550000000 0 C R 108068834 + 512 [0] 8,2 0 12753 5.560000000 0 C R 108069346 + 512 [0] 8,2 0 12754 5.570000000 0 C R 108069858 + 512 [0] 8,2 0 12755 5.570000000 0 C R 108070370 + 512 [0] 8,2 0 12756 6.570000000 0 C R 108066786 + 512 [0] 8,2 0 12757 6.590000000 328 Q R 108070882 + 8 [smbd] 8,2 0 12758 6.590000000 328 G R 108070882 + 8 [smbd] 8,2 0 12759 6.590000000 328 P N [smbd] 8,2 0 12760 6.590000000 328 I R 108070882 + 8 [smbd] 8,2 0 12761 6.590000000 328 Q R 108070890 + 8 [smbd] 8,2 0 12762 6.590000000 328 M R 108070890 + 8 [smbd] any idea how to fix this issue? - 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/