Re: How to assign devices with VT-d in KVM

2011-07-28 Thread Steve Dobbelstein
Valeri Kuchansky valeri.kuchan...@genband.com wrote on 07/27/2011 10:47:14 AM: Folks, I'm looking for some help on guest network configuration when enabling VT-d. I have fully completed steps given on http://www.linux-kvm.org/page/ How_to_assign_devices_with_VT-d_in_KVM on detaching and

Re: SR-IOV and KVM?

2011-06-27 Thread Steve Dobbelstein
Chris Friesen chris.frie...@genband.com wrote on 06/27/2011 09:15:05 AM: On Fri, 2011-06-24 at 15:10 -0600, Chris Friesen wrote: Is anyone working on SR-IOV for KVM, specifically for networking? Or is virtio good enough that it's not a pressing concern? In IBM's recent postings of results

Re: Network performance with small packets

2011-02-02 Thread Steve Dobbelstein
Michael S. Tsirkin m...@redhat.com wrote on 02/02/2011 12:38:47 PM: On Tue, Jan 25, 2011 at 03:09:34PM -0600, Steve Dobbelstein wrote: I am working on a KVM network performance issue found in our lab running the DayTrader benchmark. The benchmark throughput takes a significant hit when

Re: Network performance with small packets

2011-01-31 Thread Steve Dobbelstein
Michael S. Tsirkin m...@redhat.com wrote on 01/28/2011 06:16:16 AM: OK, so thinking about it more, maybe the issue is this: tx becomes full. We process one request and interrupt the guest, then it adds one request and the queue is full again. Maybe the following will help it stabilize? By

Re: Network performance with small packets

2011-01-28 Thread Steve Dobbelstein
mashi...@linux.vnet.ibm.com wrote on 01/27/2011 02:15:05 PM: On Thu, 2011-01-27 at 22:05 +0200, Michael S. Tsirkin wrote: One simple theory is that guest net stack became faster and so the host can't keep up. Yes, that's what I think here. Some qdisc code has been changed recently. I ran

Re: Network performance with small packets

2011-01-28 Thread Steve Dobbelstein
ste...@us.ibm.com wrote on 01/28/2011 12:29:37 PM: On Thu, 2011-01-27 at 22:05 +0200, Michael S. Tsirkin wrote: One simple theory is that guest net stack became faster and so the host can't keep up. Yes, that's what I think here. Some qdisc code has been changed recently. I ran a

Network performance with small packets

2011-01-25 Thread Steve Dobbelstein
I am working on a KVM network performance issue found in our lab running the DayTrader benchmark. The benchmark throughput takes a significant hit when running the application server in a KVM guest verses on bare metal. We have dug into the problem and found that DayTrader's use of small packets