From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Priebe - Profihost AG Subject: Re: syncfs slower than without syncfs Date: Wed, 07 Nov 2012 14:31:18 +0100 Message-ID: <509A62A6.5070104@profihost.ag> References: <509A2CE6.1010100@profihost.ag> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mail.profihost.ag ([85.158.179.208]:60968 "EHLO mail.profihost.ag" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751353Ab2KGNbZ (ORCPT ); Wed, 7 Nov 2012 08:31:25 -0500 In-Reply-To: <509A2CE6.1010100@profihost.ag> Sender: ceph-devel-owner@vger.kernel.org List-ID: To: "ceph-devel@vger.kernel.org" Am 07.11.2012 10:41, schrieb Stefan Priebe - Profihost AG: > Hello list, > > syncfs is much slower than without syncfs to me. > > If i compile latest ceph master with wip-rbd-read: > > with syncfs: > rand 4K: > write: io=1133MB, bw=12853KB/s, iops=3213, runt= 90277msec > read : io=1239MB, bw=14046KB/s, iops=3511, runt= 90325msec > seq 4M: > write: io=37560MB, bw=423874KB/s, iops=103, runt= 90738msec > read : io=103852MB, bw=1151MB/s, iops=287, runt= 90237msec > > without syncfs: > rand 4K: > write: io=3733MB, bw=42459KB/s, iops=10614, runt= 90039msec > read : io=6018MB, bw=68446KB/s, iops=17111, runt= 90038msec > seq 4M: > write: io=51204MB, bw=577328KB/s, iops=140, runt= 90820msec > read : io=150320MB, bw=1666MB/s, iops=416, runt= 90228msec > > I thought syncfs should boost the performance. Fixed - my chroot env with glibc syncfs support didn't had the libcrypto installed and it isn't in the control dependencies. Now with libcrypto i get the same results as without syncfs. Stefan