Re: [ovs-discuss] Simple test-setup: lots of TCP Retransmission, TCP Dup ACK

2012-01-23 Thread Hans van Kranenburg
Don't want to revive the thread, but just for the sake of completeness: On 01/09/2012 09:01 PM, Jesse Gross wrote: > On Sun, Jan 8, 2012 at 1:01 PM, Hans van Kranenburg > wrote: >> On 1/8/12 10:33 AM, Dave Whitla wrote: >>> >>> >>> The issue persists in all kernels on the 2.6 branch. I've not >>>

Re: [ovs-discuss] Simple test-setup: lots of TCP Retransmission, TCP Dup ACK

2012-01-09 Thread Jesse Gross
On Sun, Jan 8, 2012 at 1:33 AM, Dave Whitla wrote: > Hi Jesse, > > The issue persists in all kernels on the 2.6 branch. I've not experienced it > with 3.x kernels but my scripts have disabled TX checksumming since I first > came across the issue. > > The problem is that many people run VMs to su

Re: [ovs-discuss] Simple test-setup: lots of TCP Retransmission, TCP Dup ACK

2012-01-09 Thread Jesse Gross
On Sun, Jan 8, 2012 at 1:01 PM, Hans van Kranenburg wrote: > On 1/8/12 10:33 AM, Dave Whitla wrote: >> >> >> The issue persists in all kernels on the 2.6 branch. I've not >> experienced it with 3.x kernels but my scripts have disabled TX >> checksumming since I first came across the issue. >> >> T

Re: [ovs-discuss] Simple test-setup: lots of TCP Retransmission, TCP Dup ACK

2012-01-08 Thread Dave Whitla
I have done more or less the same thing but I switched, for various reasons, to Debian Sid with kernel 3.1.0 for my Xen hosts nodes. The issue is with the guests not the hosts. So simply upgrading your host nodes to a later kernel will not help. In our case nothing will help as we are forced to r

Re: [ovs-discuss] Simple test-setup: lots of TCP Retransmission, TCP Dup ACK

2012-01-08 Thread Hans van Kranenburg
On 1/8/12 10:33 AM, Dave Whitla wrote: The issue persists in all kernels on the 2.6 branch. I've not experienced it with 3.x kernels but my scripts have disabled TX checksumming since I first came across the issue. The problem is that many people run VMs to support "legacy" systems on new high-

Re: [ovs-discuss] Simple test-setup: lots of TCP Retransmission, TCP Dup ACK

2012-01-08 Thread Dave Whitla
Hi Jesse, The issue persists in all kernels on the 2.6 branch. I've not experienced it with 3.x kernels but my scripts have disabled TX checksumming since I first came across the issue. The problem is that many people run VMs to support "legacy" systems on new high-capacity hardware or in prod

Re: [ovs-discuss] Simple test-setup: lots of TCP Retransmission, TCP Dup ACK

2012-01-05 Thread Jesse Gross
On Thu, Jan 5, 2012 at 3:15 AM, Hans van Kranenburg wrote: > On 01/05/2012 04:04 AM, Jesse Gross wrote: >> >> On Wed, Jan 4, 2012 at 8:32 AM, Hans van Kranenburg >>  wrote: >>> >>> Any idea? >>> >>> delta.mgt.kantoor.mendix.nl:~ 0-# ethtool -k eth0 >>> Offload parameters for eth0: >>> rx-checksum

Re: [ovs-discuss] Simple test-setup: lots of TCP Retransmission, TCP Dup ACK

2012-01-05 Thread Hans van Kranenburg
On 01/05/2012 04:04 AM, Jesse Gross wrote: On Wed, Jan 4, 2012 at 8:32 AM, Hans van Kranenburg wrote: Any idea? delta.mgt.kantoor.mendix.nl:~ 0-# ethtool -k eth0 Offload parameters for eth0: rx-checksumming: on tx-checksumming: on scatter-gather: on tcp-segmentation-offload: off udp-fragmenta

Re: [ovs-discuss] Simple test-setup: lots of TCP Retransmission, TCP Dup ACK

2012-01-04 Thread Jesse Gross
On Wed, Jan 4, 2012 at 8:32 AM, Hans van Kranenburg wrote: > Any idea? > > delta.mgt.kantoor.mendix.nl:~ 0-# ethtool -k eth0 > Offload parameters for eth0: > rx-checksumming: on > tx-checksumming: on > scatter-gather: on > tcp-segmentation-offload: off > udp-fragmentation-offload: off > generic-se