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From: Jan Kiszka <jan.kiszka@siemens.com>
To: dev@dpdk.org
Subject: [dpdk-dev] vhost-switch example: huge memory need and CRC off-loading issue
Date: Fri, 7 Aug 2015 19:31:08 +0200	[thread overview]
Message-ID: <55C4EB5C.4080001@siemens.com> (raw)

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?

- 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
  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

             reply	other threads:[~2015-08-07 17:31 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-08-07 17:31 Jan Kiszka [this message]
2015-08-08  0:39 ` Ouyang, Changchun
2015-08-08  7:17   ` Jan Kiszka
2015-08-09  8:56     ` Thomas Monjalon
2015-08-10  1:10       ` Ouyang, Changchun

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