Re: [E1000-devel] Transmission limit

[Robert Olsson <Robert.Olsson@xxxxxxxxxxx>]

Scott Feldman writes:
 > Hey, turns out, I know some e1000 tricks that might help get the kpps
 > numbers up.  
 > 
 > My problem is I only have a P4 desktop system with a 82544 nic running
 > at PCI 32/33Mhz, so I can't play with the big boys.  But, attached is a
 > rework of the Tx path to eliminate 1) Tx interrupts, and 2) Tx
 > descriptor write-backs.  For me, I see a nice jump in kpps, but I'd like
 > others to try with their setups.  We should be able to get to wire speed
 > with 60-byte packets.
 > 
 > System: Intel 865 (HT 2.6Ghz)
 > Nic: 82544 PCI 32-bit/33Mhz
 > Driver: linux-2.6.9 e1000 (5.3.19-k2-NAPI), no Interrupt Delays

 > 4096 descs
 >   pkt_size = 60:   541618pps 277Mb/sec errors: 914

Hello!

Nice but I no improvements w. 82546GB @ 133 MHz on 1.6 GHz Opteron it seems.
SMP kernel linux-2.6.9-rc2

Vanilla. 
  801077pps 410Mb/sec (410151424bps) errors: 95596

Patch TXD=4096
  608690pps 311Mb/sec (311649280bps) errors: 0

Patch TXD=2048
  624103pps 319Mb/sec (319540736bps) errors: 0

Patch TXD=1024
  551289pps 282Mb/sec (282259968bps) errors: 4506

Error count is a bit confusing...

                                                --ro