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

Andrew Morton
2003-03-19T01:35:46Z

"Felipe Alfaro Solana" <felipe_alfaro@linuxmail.org> wrote:
>
> Hi,
>
> 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?

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.

> After transferring a 256MB file using NFS and SCP, I have noticed
> several "eth0: Transmit error, Tx status register 90.". I have attached
> dmesg output, ioports, iomem, lsmod and lspci.

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.