[dpdk-dev] [PATCH v2 1/1] doc: correct Vhost Sample Application guide

[Iremonger, Bernard]

Hi Huawei,

<snip>

> > > I don't think that's a right "correction": vhost-swtich would fail
> > > to
> > > start:
> > >
> > >     EAL: Error - exiting with code: 1
> > >     Cause: Cannot create mbuf pool
> > >
> > > As vhost-switch creates more mbuf than 1024M can hold.
> > >
> > > However, I do think that adding this option is necessary, otherwise,
> > > all hugepages will be allocated to vhost-switch, leaving no memory
> > > for
> > starting
> > > VM at all. (And this is kind of informatin you need to put into
> > > commit
> > log).
> > >
> > > And limiting it to "1024M" is reasonable as well, so that we can run
> > > it
> > on a
> > > desktop (or laptop) without too many memories. You just need fix
> > > vhost- switch example to not allocate too many mbufs by default.
> > >
> > > 	--yliu
> >
> > Yes the --socket-mem  <number> option is necessary.
> > I will add a note that a value of  <number> may need to be greater
> > than 1024.
> > I will submit a patch to vhost-switch to reduce the number of mbufs.
> >
> I recall we have to allocate mbufs for each queue rather than used queues
> only, so memory consumption depends on queue number. After that issue is
> fixed, I think 1024MB is enough. For the time being, you could temporarily
> use 2048M and add an explanation.
> 

I have sent a v3 of this patch which includes a note that the value of 1024 may have to be increased.
I would prefer to keep the value of 1024.

Regards,

Bernard.