[dpdk-dev] vhost-switch example: huge memory need and CRC off-loading issue

[Ouyang, Changchun]

> -----Original Message-----
> From: Thomas Monjalon [mailto:thomas.monjalon at 6wind.com]
> Sent: Sunday, August 9, 2015 4:56 PM
> To: Jan Kiszka
> Cc: dev at dpdk.org; Ouyang, Changchun
> Subject: Re: [dpdk-dev] vhost-switch example: huge memory need and CRC
> off-loading issue
> 
> 2015-08-08 09:17, Jan Kiszka:
> > On 2015-08-08 02:39, Ouyang, Changchun wrote:
> > > From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Jan Kiszka
> > >> - MAX_QUEUES of 512 causes pretty high memory need for the
> application
> > >>   (something between 1 and 2G) - is that really needed? I'm now running
> > >>   with 32, and I'm able to get away with 256M. Can we tune this
> > >>   default?
> > >
> > > Don't think we need change default just because your platform is 32,
> > > Well, my platform is 128, other platform may have other value, :-)
> >
> > Then let's make it configurable or explore the actual device needs
> > before allocating the buffer. The impact on memory consumption is way
> > too big to hard-code this, specifically as this is per physical port IIUC.
> 
> You can add a run-time option and/or add a comment in the documentation.
> It is just an example, so it must be simple to understand.

Agree, that is better than changing the default macro value.