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Re: [Qemu-devel] [POC] colo-proxy in qemu
From: |
Jason Wang |
Subject: |
Re: [Qemu-devel] [POC] colo-proxy in qemu |
Date: |
Thu, 30 Jul 2015 12:23:34 +0800 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.8.0 |
On 07/20/2015 02:42 PM, Li Zhijian wrote:
> Hi, all
>
> We are planning to implement colo-proxy in qemu to cache and compare
> packets.
> This module is one of the important component of COLO project and now
> it is
> still in early stage, so any comments and feedback are warmly welcomed,
> thanks in advance.
>
> ## Background
> COLO FT/HA (COarse-grain LOck-stepping Virtual Machines for Non-stop
> Service)
> project is a high availability solution. Both Primary VM (PVM) and
> Secondary VM
> (SVM) run in parallel. They receive the same request from client, and
> generate
> responses in parallel too. If the response packets from PVM and SVM are
> identical, they are released immediately. Otherwise, a VM checkpoint
> (on demand)
> is conducted.
> Paper:
> http://www.socc2013.org/home/program/a3-dong.pdf?attredirects=0
> COLO on Xen:
> http://wiki.xen.org/wiki/COLO_-_Coarse_Grain_Lock_Stepping
> COLO on Qemu/KVM:
> http://wiki.qemu.org/Features/COLO
>
> By the needs of capturing response packets from PVM and SVM and
> finding out
> whether they are identical, we introduce a new module to qemu
> networking called
> colo-proxy.
A question here, the packet comparing may be very tricky. For example,
some protocol use random data to generate unpredictable id or something
else. One example is ipv6_select_ident() in Linux. So COLO needs a
mechanism to make sure PVM and SVM can generate same random data?
- Re: [Qemu-devel] [POC] colo-proxy in qemu, (continued)
- Re: [Qemu-devel] [POC] colo-proxy in qemu, Jason Wang, 2015/07/27
- Re: [Qemu-devel] [POC] colo-proxy in qemu, Yang Hongyang, 2015/07/27
- Re: [Qemu-devel] [POC] colo-proxy in qemu, Dr. David Alan Gilbert, 2015/07/27
- Re: [Qemu-devel] [POC] colo-proxy in qemu, Dr. David Alan Gilbert, 2015/07/27
- Re: [Qemu-devel] [POC] colo-proxy in qemu, Yang Hongyang, 2015/07/27
Re: [Qemu-devel] [POC] colo-proxy in qemu, Dong, Eddie, 2015/07/23
Re: [Qemu-devel] [POC] colo-proxy in qemu,
Jason Wang <=
- Re: [Qemu-devel] [POC] colo-proxy in qemu, Gonglei, 2015/07/30
- Re: [Qemu-devel] [POC] colo-proxy in qemu, Dong, Eddie, 2015/07/30
- Re: [Qemu-devel] [POC] colo-proxy in qemu, Dr. David Alan Gilbert, 2015/07/30
- Re: [Qemu-devel] [POC] colo-proxy in qemu, Jason Wang, 2015/07/30
- Re: [Qemu-devel] [POC] colo-proxy in qemu, Dr. David Alan Gilbert, 2015/07/30
- Re: [Qemu-devel] [POC] colo-proxy in qemu, Gonglei, 2015/07/30
- Re: [Qemu-devel] [POC] colo-proxy in qemu, Dr. David Alan Gilbert, 2015/07/30
- Re: [Qemu-devel] [POC] colo-proxy in qemu, zhanghailiang, 2015/07/30
- Re: [Qemu-devel] [POC] colo-proxy in qemu, Dr. David Alan Gilbert, 2015/07/30
- Re: [Qemu-devel] [POC] colo-proxy in qemu, Yang Hongyang, 2015/07/30