Date: Mon, 9 Feb 2015 11:28:37 +0100 From: =?windows-1252?Q?Roger_Pau_Monn=E9?= <roger.pau@citrix.com> To: Andrew Thompson <thompsa@FreeBSD.org>, <freebsd-xen@freebsd.org> Subject: Re: xenstore memory issue Message-ID: <54D88BD5.7050703@citrix.com> In-Reply-To: <CAFAOGNTCJsXr0VOUHAtFoPvQO5VWSUvL_VKkxYoaCtrZdC6zUg@mail.gmail.com>
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Hello, El 09/02/15 a les 10.39, Andrew Thompson ha escrit: > Hi, > > > I have three VMs with Rackspace and one is behaving oddly with xenstore > memory consumption. Here are the kernel versions and vmstat -m results. > > FreeBSD us.e.com 10.0-RELEASE-p9 FreeBSD 10.0-RELEASE-p9 #0: Mon Sep 15 > 14:35:52 UTC 2014 > root@amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC > amd64 > > xenbus 16 2K - 86 16,32,64,256 > xenstore 409 4837K - 38424052 16,32,64,128,256 > xen_hvm 2 8K - 2 4096 > xen_intr 25 4K - 25 128 > > > FreeBSD uk.e.com 10.0-RELEASE-p12 FreeBSD 10.0-RELEASE-p12 #0: Tue Nov 4 > 05:07:17 UTC 2014 > root@amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC > amd64 > > xenbus 11 2K - 83 16,32,64,256 > xenstore 198 2317K - 43428137 16,32,64,128,256,512 > xen_hvm 2 8K - 2 4096 > xen_intr 24 3K - 24 128 > > > FreeBSD au.e.com 10.0-RELEASE-p12 FreeBSD 10.0-RELEASE-p12 #0: Tue Nov 4 > 05:07:17 UTC 2014 > root@amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC > amd64 > > xenbus 11 2K - 83 16,32,64,256 > xenstore 8477 101653K - 55249 16,32,64,128,256,512 > xen_hvm 2 8K - 2 4096 > xen_intr 14 2K - 14 128 > > > As you can see the third VM is using 100MB in xenstore memory and it seems > to be climbing by 1-2MB per hour. Eventually all the processes go in to > pfault state and it grinds to a halt. That's certainly weird, are you doing something different on this VM as compared to the others? Did you hot-add a nic, disk or ballooned memory? Has the VM been saved/restored or migrated? Tracking down this kind of xenstore leaks can be difficult without having a way to reproduce them. > > How should I be debugging this? Is it either a local leak or the Xen host > is to blame? Even if the host is doing something weird we should be able to cope with it, or at least detect it. Roger.home | help
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