On Tue, 2007-05-15 at 14:08 -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. > > Thanks for the pointer... I noticed that code, but could you tell me > where the "* 3" comes from? > For each gso_seg, there will be a header and the payload may span 2 pages for 1500-byte packets. We always assume 1500-byte packets because the buggy chips do not support jumbo frames.
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