From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mel Gorman Subject: Re: regression with poll(2) Date: Tue, 21 Aug 2012 08:05:15 +0100 Message-ID: <20120821070515.GA1657@suse.de> References: <20120820090443.GA3275@suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Cc: davem@davemloft.net, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, ceph-devel@vger.kernel.org, neilb@suse.de, a.p.zijlstra@chello.nl, michaelc@cs.wisc.edu, emunson@mgebm.net, eric.dumazet@gmail.com, sebastian@breakpoint.cc, cl@linux.com, akpm@linux-foundation.org, torvalds@linux-foundation.org To: Sage Weil Return-path: Content-Disposition: inline In-Reply-To: Sender: ceph-devel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org On Mon, Aug 20, 2012 at 09:54:59AM -0700, Sage Weil wrote: > > > > > > > I've retested several times and confirmed that this change leads to the > > > breakage, and also confirmed that reverting it on top of -rc1 also fixes > > > the problem. > > > > > > I've also added some additional instrumentation to my code and confirmed > > > that the process is blocking on poll(2) while netstat is reporting > > > data available on the socket. > > > > > > What can I do to help track this down? > > > > > > > Can the following patch be tested please? It is reported to fix an fio > > regression that may be similar to what you are experiencing but has not > > been picked up yet. > > This patch appears to resolve things for me as well, at least after a > couple of passes. I'll let you know if I see any further problems come up > with more testing. > Thanks very much Sage. -- Mel Gorman SUSE Labs