Subject: atrocious tx performance of gigabit cardbus re(4)
To: None <>
From: Jonathan A. Kollasch <>
List: tech-net
Date: 09/24/2007 11:24:01
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I've got a Netgear GA511 (Gigabit CardBus re(4)). I recently got
my first real gigabit peer (other than the gigabit ports on
my 10/100+1000 switch) anyway, when I have the nfe(4) send
a TCP stream at the re(4), I can get a reasonable (for some
acceptable value thereof) 30 Mbytes/s. However, when I send
=66rom the re(4) to the nfe(4) I can only get 4Mbytes/s.
=46rom 100Mbps sources on the same switch I can get full
Fast Ethernet performance to the nfe(4), so it's not
that end's problem.

Tests were performed using `nc6 -x` and progress(1).

The cbb(4)s I'm using are TI, a product 0x8031 rev 0x0 and=20
a product 0x8039 rev 0x00 on NetBSD/i386 laptops running
4.0 BETA2 and 4.99.22.

ISTR dyoung@ had performance problems with TI CardBus bridges
before, but I'm not sure if those issues are also effecting

Debugging tips would be appreciated.

	Jonathan Kollasch

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