Dirk Estreng
2006-Jan-25 16:56 UTC
[Xen-users] One domU locks up entire system? Scheduling?
Hi there, running xen 2.0.7 on a suse 9.3 box in 32Bit mode. I am experiencing a heavy slowdown of the entire dom0 and all other domUs if *one* domU gets under heavy load. So the whole system is quite unusable (DoS) if only one DomU is running wild. Is there any way to tighten this domU by adjusting something like scheduling?? the documentation around scheduling seems very rare - what are your experiences concerning this? The dom0 is a dual opteron box with a *fast* 3ware SATA disk subsystem. _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Dirk Estreng
2006-Jan-25 17:29 UTC
[Xen-users] One domU locks up entire system? Scheduling?
Hi there, running xen 2.0.7 on a suse 9.3 box in 32Bit mode. I am experiencing a heavy slowdown of the entire dom0 and all other domUs if *one* domU gets under heavy load. So the whole system is quite unusable (DoS) if only one DomU is running wild. Is there any way to tighten this domU by adjusting something like scheduling?? the documentation around scheduling seems very rare - what are your experiences concerning this? The dom0 is a dual opteron box with a *fast* 3ware SATA disk subsystem. _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
tim Doyle
2006-Jan-25 21:59 UTC
Re: [Xen-users] One domU locks up entire system? Scheduling?
Does this help? echo "cfq" > /sys/block/sda/queue/scheduler -- Timothy Doyle CEO Quantact Hosting Solutions, Inc. tim@quantact.com http://www.quantact.com Dirk Estreng wrote:>Hi there, > >running xen 2.0.7 on a suse 9.3 box in 32Bit mode. I am experiencing a heavy >slowdown of the entire dom0 and all other domUs if *one* domU gets under heavy >load. So the whole system is quite unusable (DoS) if only one DomU is running >wild. > >Is there any way to tighten this domU by adjusting something like scheduling?? >the documentation around scheduling seems very rare - what are your experiences >concerning this? > >The dom0 is a dual opteron box with a *fast* 3ware SATA disk subsystem. > > >_______________________________________________ >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
On 1/26/06, tim Doyle <tim@quantact.com> wrote:> > Does this help? > > echo "cfq" > /sys/block/sda/queue/scheduler >Alternatively you can use elevator=cfq as the command line option for both the dom0 and domU kernels in grub.conf and domU config file respectively. This will force the use of cfq as the default scheduler. By default anticipatory is the scheduler in dom0 and noop in domU. You can also try to do cpu scheduling for the domU''s which will allow other domains to get the cpu share they deserve. -- regards, Anand _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users