From mboxrd@z Thu Jan 1 00:00:00 1970 From: Shaohua Li Subject: [PATCH 2/2]SATA: enable flush non-queueable Date: Tue, 19 Apr 2011 16:44:49 +0800 Message-ID: <1303202689.3981.217.camel@sli10-conroe> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Return-path: Received: from mga02.intel.com ([134.134.136.20]:45250 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753788Ab1DSIpH (ORCPT ); Tue, 19 Apr 2011 04:45:07 -0400 Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: lkml , linux-ide Cc: Jens Axboe , Jeff Garzik , Christoph Hellwig , Tejun Heo Set SATA queue flush non-queueable. Running below test with a AHCI controller and ext4 filesystem, below patch gives around ~5% speedup. sysbench --test fileio --file-test-mode rndrw --num-threads 16 \ --file-total-size 2500MB --max-requests 150000 --max-time 3000 Signed-off-by: Shaohua Li --- drivers/ata/libata-scsi.c | 2 ++ 1 file changed, 2 insertions(+) Index: linux/drivers/ata/libata-scsi.c =================================================================== --- linux.orig/drivers/ata/libata-scsi.c 2011-04-19 14:54:37.000000000 +0800 +++ linux/drivers/ata/libata-scsi.c 2011-04-19 14:58:54.000000000 +0800 @@ -3424,7 +3424,9 @@ void ata_scsi_scan_host(struct ata_port sdev = __scsi_add_device(ap->scsi_host, channel, id, 0, NULL); if (!IS_ERR(sdev)) { + struct request_queue *q = sdev->request_queue; dev->sdev = sdev; + blk_set_queue_flush_queueable(q, false); scsi_device_put(sdev); } else { dev->sdev = NULL;