include amazon EBS performance patch in -virtual kernel

[Scott Moser]

Amazon has prepared a patch for blkfront which increases the performance of EBS volumes. In their testing, applying this patch to EC2 instances which use EBS volumes significantly increases the performance of EBS volumes. Amazon would like to have it included in the Ubuntu AMI's and made available to users of Ubuntu.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: linux-image-2.6.35-20-virtual 2.6.35-20.29
Regression: No
Reproducible: Yes
ProcVersionSignature: User Name 2.6.35-20.29-virtual 2.6.35.4
Uname: Linux 2.6.35-20-virtual i686
AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: ls: cannot access /dev/snd/: No such file or directory
AplayDevices: Error: [Errno 2] No such file or directory
Architecture: i386
ArecordDevices: Error: [Errno 2] No such file or directory
CurrentDmesg:

Date: Thu Sep 9 17:57:03 2010
Ec2AMI: ami-12bb4e7b
Ec2AMIManifest: (unknown)
Ec2AvailabilityZone: us-east-1c
Ec2InstanceType: t1.micro
Ec2Kernel: aki-407d9529
Ec2Ramdisk: unavailable
Lspci:

Lsusb: Error: command ['lsusb'] failed with exit code 1:
ProcCmdLine: root=LABEL=uec-rootfs ro
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcModules: acpiphp 17239 0 - Live 0xe6f2d000
SourcePackage: linux

[John Johansen (jjohansen)]

Test kernels with the provided patch can be found below

kernel.ubuntu.com/~jj/linux-image-2.6.35-20-virtual_2.6.35-20.30~EBSPerf_amd64.deb
kernel.ubuntu.com/~jj/linux-image-2.6.35-20-virtual_2.6.35-20.30~EBSPerf_i386.deb

[kernel-janitor (kernel-janitor)]

Fix released in 2.6.35-22.32

https://launchpad.net/ubuntu/+source/linux/2.6.35-22.32