[tulip-bug] Very slow performance with FA310TX

[John William]

>John William wrote:
> >
> > I am having problems with a Netgear FA310TX card. Transfer rates to/from 
>the
...
> > The hub indicates that the 310TX link is 100BT full duplex.
>
>Apart from the deadlock bug in 0.92 which can show up under high loads,
>Netgear FX310TXs work here under 2.2.17, and essentially saturate a
>100Mb/s network on unidirectional tranfers. But this is single
>processors, not SMP. ttcp might be useful in testing to eliminate disc
>interaction. Or try transfers between /dev/zero and /dev/null perhaps.

After writing the original message, I did some more research. Changing the 
PCI latency for the FA310TX from 248 (set at boot, I don't know who set it 
this way) to 32 increased outbound speed to 5.5MB/sec. Much better, but I 
don't know how much I should expect from this machine (dual P-100). Inbound 
transfers were not effected.

It almost seems like there is some type of overrun in the module since doing 
BIN puts to the machine give 350K/sec at most. ASC puts of the same file can 
give as much as 450K/sec and are measurably faster (even though they should 
be slower because of translation).

Yes, I will try ttcp to eliminate any HD bottlenecks. Inbound transfers to a 
real file or /dev/null are the same speed, as nearly as I can tell (ranging 
from 50 to 350K/sec), so I don't think the HD is a limitation.

When I get an opportunity, I will reboot the machine uniprocessor and see if 
that makes any difference.

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