From mboxrd@z Thu Jan 1 00:00:00 1970 From: sahilsuneja Subject: Re: Issues with Xenpaging in Xen-4.2.1 Date: Wed, 27 Feb 2013 15:46:39 -0800 (PST) Message-ID: <1362008799652-5714493.post@n5.nabble.com> References: <1361840672591-5714431.post@n5.nabble.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1361840672591-5714431.post@n5.nabble.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org sahilsuneja wrote > Hi, > > I know Xenpaging is still at an experimental stage, but I still wanted to > test it out. Sadly, I could not get it to work reliably. > > I have an AMD RVI enabled linux 3.2 host, and I am using linux 2.6.35-22 > HVM guests. After booting a few guests normally upto the host RAM limit, I > do the following to enable paging for a few guests: / >>/usr/lib/xen/bin/xenpaging -f /var/lib/xen/xenpaging/pagefile-hvm-guest -d 1 & >>xenstore-write /local/domain/1/memory/target-tot_pages $((1024*512)) / > > (here '1' is the dom_id and pagefile-hvm-guest is the backing paging file > for the hvm guest) > > I am then able to boot more VMs and I can see the corresponding pagefiles > increase in size for the xenpaging enabled guests. > > The problem is when I go back to the guests on which I enabled xenpaging, > I see the following errors when I run any basic commands like vim, top, > less /proc/meminfo: / > xc: error: Error populating page 100: Internal error > xc: error: Error loading 100 during page-in (22 = Invalid argument): > Internal error / > > This happens even when there is paged-out memory from other guests to be > had, and the system is not out of RAM for paging in guest's memory. > > It seems like a page-in error on gfn 100, but that is strange as, from I > what I gathered from the xenpaging code, policy_default.c starts paging > only after half of the guest's gfns : current_gfn = max_pages / 2 (inside > policy_default.c: policy_init()) > > I was expecting there to be other stability issues rather that this kind > of an error. > > Could someone please help me understand this and let me know if I am doing > something incorrectly. > > Also, there do not seem to be any interesting messages in xm dmesg or in > /var/log/xen*. > > Thanks, > > Sahil Suneja > Ph.D. Student > University of Toronto -- View this message in context: http://xen.1045712.n5.nabble.com/Issues-with-Xenpaging-in-Xen-4-2-1-tp5714431p5714493.html Sent from the Xen - Dev mailing list archive at Nabble.com.