From: Alex Markuze <alex@weka.io>
To: Helmut Sim <simhelmut@gmail.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] two tso related questions
Date: Tue, 16 Dec 2014 11:10:35 +0200 [thread overview]
Message-ID: <CAKfHP0WY8n1tyxw7jbeBU2EgrAziyv+1h+xAuLyQ7Uu9AgiSzw@mail.gmail.com> (raw)
In-Reply-To: <CAF8yGaERQQ6DGPOotsJcXWuEzF=otRyA_ei7nffy8-bfZGWdNQ@mail.gmail.com>
On Mon, Dec 15, 2014 at 10:20 PM, Helmut Sim <simhelmut@gmail.com> wrote:
>
> Hi,
>
> While working on TSO based solution I faced the following two questions:
>
> 1.
> is there a maximum pkt_len to be used with TSO?, e.g. let's say if seg_sz
> is 1400 can the entire segmented pkt be 256K (higer than 64K) ?, then the
> driver gets a list of chanined mbufs while the first mbuf is set to TSO
> offload.
>
TSO segments a TCP packet into mtu sied bits. The TCP/IP protocols are
limited to 64K due to the length fields being 16bit wide. You can't build a
valid packet longer then 64K regardless of the NIC.
> 2.
> I wonder, Is there a specific reason why TSO is supported only for IXGBE
> and not for IGB ? the 82576 NIC supports TSO though.
> Is it due to a kind of tecnical barrier or is it because of priorities?
>
> It will be great if someone from the forum could address this.
>
> Thanks,
> Sim
>
next prev parent reply other threads:[~2014-12-16 9:10 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-15 20:20 Helmut Sim
2014-12-16 9:10 ` Alex Markuze [this message]
2014-12-16 12:24 ` Helmut Sim
2014-12-16 14:04 ` Alex Markuze
2014-12-17 7:17 ` Helmut Sim
2014-12-17 13:02 ` Olivier MATZ
2015-01-04 8:50 ` Helmut Sim
2015-01-04 9:57 ` Alex Markuze
2015-01-04 10:13 ` Helmut Sim
2015-01-05 8:53 ` Olivier MATZ
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