Joseph, apologies for the delay on this. I have finally managed to retest the kernel you have provided.
For reference, I added the following disks to my server: * 4 x Micron P320 * 2 x Intel 910s (presented as 4 separate SCSI devices) * 1 x Fusion-io ioDrive2 I created 10 LVM Logical Volumes on each one of these 9 devices. Next, I created 10 Saucy 64bit VMs (each with 2 vCPUs and 512 MB RAM) and assigned one LV from each device to it. Each data point in the graphs I am attaching now correspond to the aggregate throughput of all LVs per VM. Your kernel (indicated by Ubuntu 13.10 x86_64 + Backports) allows the VMs to reach the 7 GB/s mark while the kernel without the backports will not go past the 5 GB/s mark. I hope this confirms that these patches are essential and that you can include them as soon as possible. Regards, Felipe -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1319003 Title: Storage performance regression when Xen backend lacks persistent- grants support To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1319003/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
