From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Nelson Subject: Re: syncfs slower than without syncfs Date: Wed, 07 Nov 2012 09:04:00 -0600 Message-ID: <509A7860.6020805@inktank.com> References: <509A2CE6.1010100@profihost.ag> <509A62A6.5070104@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-ia0-f174.google.com ([209.85.210.174]:57542 "EHLO mail-ia0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754175Ab2KGPD5 (ORCPT ); Wed, 7 Nov 2012 10:03:57 -0500 Received: by mail-ia0-f174.google.com with SMTP id y32so1145185iag.19 for ; Wed, 07 Nov 2012 07:03:56 -0800 (PST) In-Reply-To: <509A62A6.5070104@profihost.ag> Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Stefan Priebe - Profihost AG Cc: "ceph-devel@vger.kernel.org" Whew, glad you found the problem Stefan! I was starting to wonder what was going on. :) Do you mind filling a bug about the control dependencies? Mark On 11/07/2012 07:31 AM, Stefan Priebe - Profihost AG wrote: > 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 > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html