Hi Alberto, On Fri, Sep 19, 2008 at 11:26:09AM -0600, Alberto Treviño wrote: > I am using KVM 69 and kernel 2.6.25.17 to host several VM's in a large > server. So far, everything has been great. Except I'm adding a Windows > Server VM that will run a SQL Server database. A few times I've noticed > that I/O becomes a bottleneck for the VM and Windows VM freezes for a few > seconds. Oh well, no biggie. Except, every so often, these I/O bottlenecks > start to affect other VM's and they freeze as well for a few seconds. I > don't really care of one VM does so much I/O that it freezes itself > temporarily. I just don't want I/O bottlenecks on one VM to affect other > VM's. > > My questions are: > > 1. Is this a problem anyone else has experienced and has it been fixed in a > later KVM release? > > 2. I'm using the CFQ scheduler. Would the deadline scheduler do a better > job? > > 3. Any other suggestions to improve this problem?
Are you using filesystem backed storage for the guest images or direct block device storage? I assume there's heavy write activity on the guests when these hangs happen? ext3 with ordered data mode has latency issues on fsync. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
