Re: Call for re(4) TSO/VLAN testers

From: Pyun YongHyeon <pyunyh_at_gmail.com>
Date: Wed, 15 Nov 2006 08:15:17 +0900
On Tue, Nov 14, 2006 at 07:50:22PM +0100, Pieter de Goeje wrote:
 > On Tuesday 14 November 2006 01:01, Pyun YongHyeon wrote:
 > > ATM re(4) uses still small number of Tx descriptors(i.e. 64 entries)
 > > due to the hardware limitation of 8139C+. 8169 family can have
 > > up to 1024 Tx descriptors. If we want to use more Tx descriptors
 > > on 8169 the internal structure should be modified to support both
 > > 8139C+ and 8169. I guess it would require major Tx path overhaul.
 > > Because I have just plain PCI 8169 hardware I can't sure increasing
 > > number of Tx descriptors on re(4) help Tx performance of the driver.
 > 
 > So the 8169 has 64 Tx descriptors and the 8169S 1024?
 > 

All 8169 chipsets support 1024 Tx descriptors.

 > (dmesg 6-stable)
 > re0: <RealTek 8169S Single-chip Gigabit Ethernet> port 0xd000-0xd0ff mem 
 > 0xe8000000-0xe80000ff irq 17 at device 9.0 on pci0
 > miibus0: <MII bus> on re0
 > rgephy0: <RTL8169S/8110S media interface> on miibus0
 > rgephy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseTX, 
 > 1000baseTX-FDX, auto
 > 
 > > I guess 64 Tx descriptors are not sufficient to saturate giga bit
 > > link.
 > > Would please try attached patch and report the performance of patched
 > > re(4) driver?
 > 
 > Where can I find this patch?
 > 
Attached.

-- 
Regards,
Pyun YongHyeon

Received on Tue Nov 14 2006 - 22:49:22 UTC

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