Re: 2.6.15.1: UDP fragments >27208 bytes lost with ne2k-pci on DP83815 (was Re: persistent nasty hang in sync_page killing NFS (ne2k-pci / DP83815-related?), i686/PIII)

[thockin@hockin.org]

On Mon, Jan 30, 2006 at 05:31:24PM +0000, Nix wrote:
> ... you are quite right. I'm mounting with an rsize and wsize of 32768
> (i.e., the default negotiated between a recent Linux NFS client and
> kernel server), and, completely consistently, 31504 bytes are sent and
> *only 27208 bytes are received*. This is so consistent that there's no
> way that this could be due to network congestion (unless it's getting
> jammed up inside the receiving NIC or something: it's an NE2K card and
> they're rather crap so maybe the card is just too slow: my determination
> to replace the card has just gone up a notch. But nonetheless if it was
> getting lost by the card I'd see TCP retransmissions, which `netstat -s'
> assures me I do not).
> 
> This explains why I don't see a problem with DNS: the number of DNS
> packets >27208 bytes can be counted on the fingers of one foot.
> 
> Captures are available, but I gathered about half a minute's traffic
> so they're quite large (1Mb apiece).
> 
> Tim? Any ideas? Is anyone else with this card seeing this problem?

I've never heard anything like that.  I don't have many of these cards
around, but Cobalt shipped tens of thousands, and I don't hear of anything
resembling this.

odd indeed.