Whether using the pv devices or the emulated ones should hardy make a difference with respect of the timeouts and data loss which is reported here. It has a performance benefit for the communication between the instance and the Xen host, though. And we are about to release kernel updates to have the required drivers built-in and not as modules (like they are now). But those are currently in testing (for 11.04 and 11.10).
For the timeouts, I wonder whether that could be an effect of storage on ec2 usually being network attached, together with a high(er) general utilization. Actually moving from emulated to pv devices could make that even worse. Surely there also is a chance that the pv driver handles such delays/contention better than the emulated device driver. But it should be possible to switch to the pv drivers even with the current images. Just add the pci-platform, xen-netfront and xen-blkfront drivers into /etc/initramfs-tools/modules, then run update-initramfs -u and make sure that the root device in /boot/grub/grub.cfg and /etc/fstab is using uuid or labels (because on reboot with pv drivers enabled device names will switch from hd to xvd for the block devices). -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/704022 Title: xen_emul_unplug=unnecessary on kernel cmdline is required in ec2 hvm To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/704022/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
