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

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Message-ID: <1179265719.25622.40.camel@dell>
Date:	Tue, 15 May 2007 14:48:39 -0700
From:	"Michael Chan" <mchan@...adcom.com>
To:	"Roland Dreier" <rdreier@...co.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

On Tue, 2007-05-15 at 13:52 -0700, Roland Dreier wrote:

> 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.

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