Re: [dpdk-dev] [PATCH] vhost: Fix the vhost broken issue

[Thomas Monjalon <thomas.monjalon@6wind.com>]

2014-10-17 03:19, Xie, Huawei:
> From: Ouyang, Changchun
> > From: Xie, Huawei
> > > I generated the vhost example patch based on vhost library, but find
> > > there is
> > > issue with --mergeable feature.
> > > Only thousands of packets could be sent.
> > > Then I tried the latest vhost example,  which is just before my vhost
> > > lib patch, I found that not only it has the issue Which is fixed by the
> > > following patch but the --mergeable feature also doesn't work.
> > > Haven't got the change to dig into it.
> > > 
> > > Hints here:
> > > 1. mbuf allocation failure after thousands of packets.
> > > 2. disable INC_VEC(vectore scatter receive) in configure could solve
> > > this.
> > > 3. tried sending the packets directly out after receiving from vmdq
> > > queue, it
> > > works.
> > > 
> > > Could you root cause the issue, Changchun? You could work on the most
> > > recent
> > > example.
> > 
> > No problem, I will investigate the root cause.
> > 
> > But before figuring out the root cause, I think we could add check in your new
> > sample to
> > Check the INC_VEC is enable or not, If it is enabled, print error message and hint
> > user
> > Disable it in config file if mergeable feature is triggered in vhost. Then this issue
> > should not
> > block you from sending out your vhost app patch.
> > 
> > Your vhost app patch will block my another patch about multicast feature as
> > your vhost lib patch delete the vhost sample app totally.
> > So expect your vhost app patch send out soon.
> 
> Thomas:
> Thoughts about this? Could I send example patch with this walk around?

Yes, please send the new example with this small workaround.
It's better than nothing.

-- 
Thomas