Hi,Dave
On 12/02/2015 12:44 AM, Dr. David Alan Gilbert wrote:
* Zhang Chen (zhangchen.f...@cn.fujitsu.com) wrote:
Hi,all
This patch add an colo-proxy object, COLO-Proxy is a part of COLO,
based on qemu netfilter and it's a plugin for qemu netfilter. the function
keep Secondary VM connect normal to Primary VM and compare packets
sent by PVM to sent by SVM.if the packet difference,notify COLO do
checkpoint and send all primary packet has queued.
You can also get the series from:
https://github.com/zhangckid/qemu/tree/colo-proxy-V1
Usage:
primary:
-netdev tap,id=bn0 -device e1000,netdev=bn0
-object colo-proxy,id=f0,netdev=bn0,queue=all,mode=primary,addr=ip:port
secondary:
-netdev tap,id=bn0 -device e1000,netdev=bn0
-object colo-proxy,id=f0,netdev=bn0,queue=all,mode=secondary,addr=ip:port
If we have more than one NIC on the guest, do you intend to allow
multiple colo-proxy's ?
Yes,we support.Colo-proxy based on netfilter, same to filter-buffer,
proxy attach your netdev.
but we haven't test it
Having read through the series, it looks like the main missing piece
is the work to synchronise sequence numbers.
Yes, we will support it in the futrue
I think also you'll need to clean out the connection hash when either
you see both sides have closed the connection or (maybe after some
time of idleness as well? Otherwise we'd just accumulate dead connections
overtime).
I'm guessing the buffer filter also has to be created on the command line?
How does the order of buffers work?
Dave
In colo-proxy we have done buffer filter's work,so we just need startup
colo-proxy.
Thanks for review
zhangchen
NOTE:
queue must set "all". See enum NetFilterDirection for detail.
colo-proxy need queue all packets
colo-proxy V1 just a demo of colo proxy,not pass test with colo upstream
## 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.
v1:
initial patch.
zhangchen (9):
Init colo-proxy object based on netfilter
jhash: add linux kernel jhashtable in qemu
colo-proxy: add colo-proxy framework
colo-proxy: add colo-proxy setup work
net/colo-proxy: add colo packet handler
net/colo-proxy: add packet forward function
net/colo-proxy: add packet enqueue and handle function
net/colo-proxy: enqueue primary and secondary packet
net/colo-proxy: add packet compare and notify checkpoint
include/qemu/jhash.h | 52 ++++
net/Makefile.objs | 1 +
net/colo-proxy.c | 745 +++++++++++++++++++++++++++++++++++++++++++++++++++
net/colo-proxy.h | 124 +++++++++
qemu-options.hx | 4 +
vl.c | 3 +-
6 files changed, 928 insertions(+), 1 deletion(-)
create mode 100644 include/qemu/jhash.h
create mode 100644 net/colo-proxy.c
create mode 100644 net/colo-proxy.h
--
1.9.1
--
Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK
.
