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qemu-options.hx: Clean up and fix typo for colo-compare

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Fix some typo and optimized some descriptions.

Signed-off-by: Zhang Chen <chen.zhang@intel.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Zhang Chen 2020-06-24 09:20:42 +08:00 committed by Jason Wang
parent a2e5cb7a87
commit 2b28a7ef90
1 changed files with 16 additions and 16 deletions
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32
qemu-options.hx
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@ -4696,24 +4696,24 @@ SRST
tools such as tcpdump or Wireshark.
``-object colo-compare,id=id,primary_in=chardevid,secondary_in=chardevid,outdev=chardevid,iothread=id[,vnet_hdr_support][,notify_dev=id][,compare_timeout=@var{ms}][,expired_scan_cycle=@var{ms}][,max_queue_size=@var{size}]``
Colo-compare gets packet from primary\_inchardevid and
secondary\_inchardevid, than compare primary packet with
secondary packet. If the packets are same, we will output
primary packet to outdevchardevid, else we will notify
colo-frame do checkpoint and send primary packet to
outdevchardevid. In order to improve efficiency, we need to put
the task of comparison in another thread. If it has the
vnet\_hdr\_support flag, colo compare will send/recv packet with
vnet\_hdr\_len. Then compare\_timeout=@var{ms} determines the
maximum delay colo-compare wait for the packet.
The expired\_scan\_cycle=@var{ms} to set the period of scanning
expired primary node network packets. The max\_queue\_size=@var{size}
is to set the max compare queue size depend on user environment.
If you want to use Xen COLO, will need the notify\_dev to
Colo-compare gets packet from primary\_in chardevid and
secondary\_in, then compare whether the payload of primary packet
and secondary packet are the same. If same, it will output
primary packet to out\_dev, else it will notify COLO-framework to do
checkpoint and send primary packet to out\_dev. In order to
improve efficiency, we need to put the task of comparison in
another iothread. If it has the vnet\_hdr\_support flag,
colo compare will send/recv packet with vnet\_hdr\_len.
The compare\_timeout=@var{ms} determines the maximum time of the
colo-compare hold the packet. The expired\_scan\_cycle=@var{ms}
is to set the period of scanning expired primary node network packets.
The max\_queue\_size=@var{size} is to set the max compare queue
size depend on user environment.
If user want to use Xen COLO, need to add the notify\_dev to
notify Xen colo-frame to do checkpoint.
we must use it with the help of filter-mirror and
filter-redirector.
COLO-compare must be used with the help of filter-mirror,
filter-redirector and filter-rewriter.
::