Return-Path: linux-nfs-owner@vger.kernel.org Received: from mx12.netapp.com ([216.240.18.77]:25499 "EHLO mx12.netapp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751878Ab3AYV3L convert rfc822-to-8bit (ORCPT ); Fri, 25 Jan 2013 16:29:11 -0500 From: "Myklebust, Trond" To: "J. Bruce Fields" CC: Ben Myers , Olga Kornievskaia , "linux-nfs@vger.kernel.org" , Jim Rees Subject: RE: sunrpc: socket buffer size tuneable Date: Fri, 25 Jan 2013 21:29:09 +0000 Message-ID: <4FA345DA4F4AE44899BD2B03EEEC2FA91833BFAB@sacexcmbx05-prd.hq.netapp.com> References: <20130125192935.GA32470@sgi.com> <20130125202107.GD29596@fieldses.org> <20130125203507.GW30652@sgi.com> <4FA345DA4F4AE44899BD2B03EEEC2FA91833BF5A@sacexcmbx05-prd.hq.netapp.com> <20130125212106.GH29596@fieldses.org> In-Reply-To: <20130125212106.GH29596@fieldses.org> Content-Type: text/plain; charset="Windows-1252" MIME-Version: 1.0 Sender: linux-nfs-owner@vger.kernel.org List-ID: > -----Original Message----- > From: J. Bruce Fields [mailto:bfields@fieldses.org] > Sent: Friday, January 25, 2013 4:21 PM > To: Myklebust, Trond > Cc: Ben Myers; Olga Kornievskaia; linux-nfs@vger.kernel.org; Jim Rees > Subject: Re: sunrpc: socket buffer size tuneable > > On Fri, Jan 25, 2013 at 09:12:55PM +0000, Myklebust, Trond wrote: > > Why is it not sufficient to clamp the TCP values of 'snd' and 'rcv' using > sysctl_tcp_wmem/sysctl_tcp_rmem? > > ...and clamp the UDP values using > sysctl_[wr]mem_min/sysctl_[wr]mem_max?. > > Yeah, I was just looking at that--so, Ben, something like: > > echo "1048576 1048576 4194304" >/proc/sys/net/ipv4/tcp_wmem > > But I'm unclear on some of the details: do we need to set the minimum or > only the default? And does it need any more allowance for protocol > overhead? I meant adding a check either to svc_sock_setbufsize or to the 2 call-sites that enforces the above limits. Trond