netdev - Re: [RFC] New driver API to speed up small packets xmits

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Message-ID: <adaps51pzg8.fsf@cisco.com>
Date:	Tue, 15 May 2007 14:08:23 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	"Michael Chan" <mchan@...adcom.com>
Cc:	"David Miller" <davem@...emloft.net>, ak@...e.de,
	krkumar2@...ibm.com, "netdev" <netdev@...r.kernel.org>
Subject: Re: [RFC] New driver API to speed up small packets xmits

 > > Well, IPoIB doesn't do netif_wake_queue() until half the device's TX
 > > queue is free, so we should get batching.  However, I'm not sure that
 > > I can count on a fudge factor ensuring that there's enough space to
 > > handle everything skb_gso_segment() gives me -- is there any reliable
 > > way to get an upper bound on how many segments a given gso skb will
 > > use when it's segmented?
 > 
 > Take a look at tg3.c.  I use (gso_segs * 3) as the upper bound.

Thanks for the pointer... I noticed that code, but could you tell me
where the "* 3" comes from?

 - R.
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