Hi, all:
    I am trying to improve the performance of netfront/netback, and  I found 
that there were some discussion about PV network performance improvement in 
devel mailing list ([1]). The proposals mentioned  in [1] are helpful, such as 
multipage ring,  multiqueue, etc, and some of them have already merged into 
upstream.
    However, I am wondering if we have already used multipage ring,  why 
"seperate request and response ring" listed in [1] is also helpful for 
performance improvement? I have read the implementation of vmxnet3 driver, it 
does have separated request and response rings, but I can not understand what 
the advantage of this method is.
    Thanks.

[1] http://lists.xen.org/archives/html/xen-devel/2013-05/msg01904.html
----
Best Regards
Lui


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