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Date: Tue, 22 Mar 2016 10:27:40 +0000
From: Bruce Richardson <bruce.richardson@intel.com>
To: Clarylin L <clearasu@gmail.com>
Cc: dev@dpdk.org
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Subject: Re: [dpdk-dev] multi-segment mbuf
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On Mon, Mar 21, 2016 at 04:34:50PM -0700, Clarylin L wrote:
> I am trying multi-segment mbuf, but it seems not working.
> 
> On my target host, the mbuf size is set to 2048 and I am trying to send
> large packet to it (say 2500 bytes without fragmentation) from another
> host. I enabled both jumbo_frame and enable_scatter for the port. But I saw
> on the target only one mbuf is received with data_len equal to 2500 (it's
> supposed to be a two-mbuf chain).  Although mbuf itself is not working as
> expected, ping between two hosts succeeded (large ping size; no
> fragmentation).
> 
> 1. my mbuf size is only 2048. how can it support receiving such large
> packet in one mbuf?
> 
> 2.how to make it work as expected (enable multi-segment mbuf and receive
> using mbuf chain when needed)?
> 
> Appreciate your help.

Hi,

when you get the single mbuf with data_len == 2500, what is the buf_len value
reported as?

/Bruce