Re: 2.5.65-mm1: eth0: Transmit error, Tx status register 90

From: Felipe Alfaro Solana (felipe_alfaro@linuxmail.org)
Date: Wed Mar 19 2003 - 06:24:42 EST

----- Original Message -----
From: Andrew Morton <akpm@digeo.com>
Date: Tue, 18 Mar 2003 19:18:33 -0800
To: "Felipe Alfaro Solana" <felipe_alfaro@linuxmail.org>
Subject: Re: 2.5.65-mm1: eth0: Transmit error, Tx status register 90
 
> "Felipe Alfaro Solana" <felipe_alfaro@linuxmail.org> wrote:
> >
> > I've been benchmarking file copy operations between 2.5.65-mm1
> > and 2.4.20-2.51 since I have noticed that transferring files from my
> > 2.4.20 machine to 2.5.65-mm1 gives an steady 10MBps throughput
> > but doing the opposite (from 2.5.65-mm1 to 2.4.20) gives me a
> > mere 3MBps throughput.
>
> Is it slow with both scp and NFS? Or just NFS?
 
Well, it seems the network transport is slow. I have benchmarked
using NFS, FTP and SCP and *all* of them are 4 orders of magnitude
slower when sending data (from 2.5 to 2.4), but behave normally
when receiving data (from 2.4 to 2.5).
 
> If just NFS then yes, I see this too. Transferring files 2.5->2.4 over NFS
> is several times slower than 2.4->2.4 or 2.5->2.5. Quite repeatable.
 
The problem is that FTP is also four times slower. Here are my timings
against 2.5.64 vanilla:
 
Test case: 128MB file (dd if=/dev/zero of=test bs=1024k count=128)
 
NFS
---
time cp 2.4 -> 2.5: 0m11.759s
time cp 2.5 -> 2.4: 0m39.541s
 
FTP
---
time get 2.4 -> 2.5: 11.5s
time put 2.5 -> 2.4: 43.3s
 
So it seems a problem with the network transport. This doesn't
happen with 2.4 on the same hardware: NEC Chrom@ laptop,
TI CardBus bridge, 3Com Corporation 3CCFE575CT Cyclone
CardBus (rev 10) NIC.
 
Attached is my .config file. It's worth a look since I needed to
build CardBus into the kernel (my RedHat distro doesn't work
with CardBus built as a module).
 
> That's a transmit underrun. The PCI/memory system was not able to feed data
> into the NIC fast enough.
> Please determine when this started. 2.5.64 would be a good kernel to test
> because it doesn't have the PCI changes.
 
During benchmarks with 2.5.64 I've also seen this errors,
although they were quite few (only two).
 
Now, what else? I'm lost...
Thanks!
 
   Felipe 

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