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

Ouyang, Changchun changchun.ouyang at intel.com
Sat Aug 8 02:39:14 CEST 2015

> -----Original Message-----
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Jan Kiszka
> Sent: Saturday, August 8, 2015 1:31 AM
> To: dev at dpdk.org
> Subject: [dpdk-dev] vhost-switch example: huge memory need and CRC off-
> loading issue
> Hi again,
> two findings in the vhost-switch example code that can cause grey hair for
> starters:
> - 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, :-)

> - hw_strip_crc is set to 0, but either the igb driver or the ET2 quad
>   port adapter I'm using is ignoring this. It does strip the CRC, so

Igb and ET2 should NOT ignore it.

>   does software, and I'm losing 4 bytes on each unpadded packet. Known
>   issue?
> Thanks,
> Jan
> --
> Siemens AG, Corporate Technology, CT RTC ITP SES-DE Corporate
> Competence Center Embedded Linux

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