Date: Mon, 19 Feb 2018 11:02:19 +0000 From: Roger Pau =?iso-8859-1?Q?Monn=E9?= <roger.pau@citrix.com> To: Laurence Pawling <laurence.pawling@globalsign.com> Cc: "freebsd-xen@freebsd.org" <freebsd-xen@freebsd.org>, "freebsd-virtualization@freebsd.org" <freebsd-virtualization@freebsd.org>, "freebsd-net@freebsd.org" <freebsd-net@freebsd.org>, David King <david.king@globalsign.com>, Vlad Galu <vlad.galu@globalsign.com> Subject: Re: multi-vCPU networking issues as client OS under Xen Message-ID: <20180219110219.r4yrgbc4yomb3gly@MacBook-Pro-de-Roger.local> In-Reply-To: <D19A161B-A26C-4CB8-8CF8-45A1195433C7@globalsign.com> References: <D1AF75E7-49F9-4628-8B26-3ACB64994C97@globalsign.com> <20180219100558.adgb6m5ukdfvxehp@MacBook-Pro-de-Roger.local> <D19A161B-A26C-4CB8-8CF8-45A1195433C7@globalsign.com>
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On Mon, Feb 19, 2018 at 10:42:08AM +0000, Laurence Pawling wrote: > > When using >1 vCPUs can you set hw.xn.num_queues=1 on > > /boot/loader.conf and try to reproduce the issue? > > > > I'm afraid this is rather related to multiqueue (which is only used > > if >1 vCPUs). > > > > Thanks, Roger. > > Roger - thanks for your quick reply, this is confirmed. Setting hw.xn.num_queues=1 on the server VM when vCPUs > 1 prevents the issue. I've also been told that in order to discard this being a XenServer specific issue you should execute the following on Dom0 and reboot the server: # xe-switch-network-backend bridge And then try to reproduce the issue again with >1 vCPUs (and of course removing the queue limit in loader.conf) > For reference, please can you comment on the performance impact of this? I'm afraid I don't have any numbers. Roger.
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