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Date: Sun, 30 Mar 2014 21:00:59 -0700
From: John-Mark Gurney <jmg@funkthat.com>
To: Pyun YongHyeon <yongari@freebsd.org>
Subject: Re: svn commit: r263957 - in head/sys: dev/age dev/alc dev/ale
 dev/bce dev/bge dev/fxp dev/jme dev/msk dev/nfe dev/sge pci
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Pyun YongHyeon wrote this message on Mon, Mar 31, 2014 at 01:54 +0000:
> Author: yongari
> Date: Mon Mar 31 01:54:59 2014
> New Revision: 263957
> URL: http://svnweb.freebsd.org/changeset/base/263957
> 
> Log:
>   Increase the number of TX DMA segments from 32 to 35.  It turned
>   out 32 is not enough to support a full sized TSO packet.
>   While I'm here fix a long standing bug introduced in r169632 in
>   bce(4) where it didn't include L2 header length of TSO packet in
>   the maximum DMA segment size calculation.

I assume all of the hardware supports this increase?

Also, is there a reason to only increase up to 35 and not something
larger, like 64?  Is there a memory or performance penalty?

-- 
  John-Mark Gurney				Voice: +1 415 225 5579

     "All that I will do, has been done, All that I have, has not."