Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753536AbbETOcJ (ORCPT ); Wed, 20 May 2015 10:32:09 -0400 Received: from smtp02.citrix.com ([66.165.176.63]:64091 "EHLO SMTP02.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753287AbbETOcF (ORCPT ); Wed, 20 May 2015 10:32:05 -0400 X-IronPort-AV: E=Sophos;i="5.13,464,1427760000"; d="scan'208";a="266908766" Message-ID: <555C9A3F.7000207@citrix.com> Date: Wed, 20 May 2015 15:29:19 +0100 From: Julien Grall User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Icedove/31.6.0 MIME-Version: 1.0 To: Julien Grall , Wei Liu , CC: , , , , , , Suravee Suthikulpanit Subject: Re: [Xen-devel] [RFC 21/23] net/xen-netback: Make it running on 64KB page granularity References: <1431622863-28575-1-git-send-email-julien.grall@citrix.com> <1431622863-28575-22-git-send-email-julien.grall@citrix.com> <20150515023534.GE19352@zion.uk.xensource.com> <5555E81E.8070803@citrix.com> <20150515153143.GA8521@zion.uk.xensource.com> <5559D6EE.3030400@citrix.com> <20150518125406.GA9503@zion.uk.xensource.com> <555BBFA7.8030502@citrix.com> In-Reply-To: <555BBFA7.8030502@citrix.com> Content-Type: text/plain; charset="windows-1252" Content-Transfer-Encoding: 7bit X-DLP: MIA1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1424 Lines: 35 On 19/05/15 23:56, Julien Grall wrote: >> If you're wgetting from another host, I would suggest wgetting from Dom0 >> to limit the problem between Dom0 and DomU. > > Thanks to Wei, I was able to narrow the problem. It looks like the > problem is not coming from netback but somewhere else down in the > network stack: wget/ssh between Dom0 64KB and DomU is working fine. > > Although, wget/ssh between a guest and an external host doesn't work > when Dom0 is using 64KB page granularity unless if I start a tcpdump on > the vif in DOM0. Anyone an idea? > > I have no issue to wget/ssh in DOM0 to an external host and the same > kernel with 4KB page granularity (i.e same source code but rebuilt with > 4KB) doesn't show any issue with wget/ssh in the guest. > > This has been tested on AMD Seattle, the guest kernel is the same on > every test (4KB page granularity). > > I'm planning to give a try tomorrow on X-gene (ARM64 board and I think > 64KB page granularity is supported) to see if I can reproduce the bug. It's working on X-gene with the same kernel and configuration. I guess we can deduce that it's a bug in the AMD network driver. Regards, -- Julien Grall -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/