Which cpu is hit when domU does the heavy disk IO? dom0 cpu or domU cpu? I can see tapdisk in dom0 eating CPU. I have (dom0-cpus 1) setup in xen config. Thanks! Paras. _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
On Tue, Aug 24, 2010 at 5:51 AM, Paras pradhan <pradhanparas@gmail.com> wrote:> Which cpu is hit when domU does the heavy disk IO? dom0 cpu or domU cpu? IShould be both.> can see tapdisk in dom0 eating CPU. I have (dom0-cpus 1) setup in xen > config.In my experience using tapdisk increase dom0 CPU load even more compared to phy:/ with LVM-backed domUs. -- Fajar _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
In my experience it is only dom0, domU is about 1-2% when doing heavy io, but dom0 can go to 20%. Best, Lei On Mon, Aug 23, 2010 at 9:19 PM, Fajar A. Nugraha <fajar@fajar.net> wrote:> On Tue, Aug 24, 2010 at 5:51 AM, Paras pradhan <pradhanparas@gmail.com> wrote: >> Which cpu is hit when domU does the heavy disk IO? dom0 cpu or domU cpu? I > > Should be both. > >> can see tapdisk in dom0 eating CPU. I have (dom0-cpus 1) setup in xen >> config. > > In my experience using tapdisk increase dom0 CPU load even more > compared to phy:/ with LVM-backed domUs. > > -- > Fajar > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users >_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
I personally saw 100% dom0 load with 1.2Gb iscsi traffic for guest, performing iozone tests... But I belive this is more iscsi overhead, than xen blk driver. В Втр, 24/08/2010 в 07:59 -0400, Lei Lu пишет:> In my experience it is only dom0, domU is about 1-2% when doing heavy > io, but dom0 can go to 20%. > > Best, > Lei > > On Mon, Aug 23, 2010 at 9:19 PM, Fajar A. Nugraha <fajar@fajar.net> wrote: > > On Tue, Aug 24, 2010 at 5:51 AM, Paras pradhan <pradhanparas@gmail.com> wrote: > >> Which cpu is hit when domU does the heavy disk IO? dom0 cpu or domU cpu? I > > > > Should be both. > > > >> can see tapdisk in dom0 eating CPU. I have (dom0-cpus 1) setup in xen > >> config. > > > > In my experience using tapdisk increase dom0 CPU load even more > > compared to phy:/ with LVM-backed domUs. > > > > -- > > Fajar > > > > _______________________________________________ > > Xen-users mailing list > > Xen-users@lists.xensource.com > > http://lists.xensource.com/xen-users > > > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users