Re: Firewire/USB Card for Qube 2

[email protected] wrote:

> Speaking of speeds, frequencies and bandwidths seems
> that regardless of the speed of the Ethernet adapters
> the Qube 2 can not go beyond 10MBits/s speed.

How did you measure the speed?
ttcp on my RaQ (not RaQ2) shows:
---
# uname -v
NetBSD 4.99.63 (GENERIC) #83: Sat May 24 01:56:56 JST 2008  \
tsutsui@mirage:/usr/src/sys/arch/cobalt/compile/GENERIC
# ttcp -rs
ttcp-r: buflen=8192, nbuf=2048, align=16384/0, port=5001  tcp
ttcp-r: socket
ttcp-r: accept from 192.168.20.1
ttcp-r: 16777216 bytes in 6.39 real seconds = 2562.00 KB/sec +++
ttcp-r: 2051 I/O calls, msec/call = 3.19, calls/sec = 320.72
ttcp-r: 0.0user 2.6sys 0:06real 41% 0i+0d 0maxrss 0+2pf -15+45csw
# ttcp -ts 192.168.20.1
ttcp-t: buflen=8192, nbuf=2048, align=16384/0, port=5001  tcp  -> 192.168.20.1
ttcp-t: socket
ttcp-t: connect
ttcp-t: 16777216 bytes in 7.20 real seconds = 2276.17 KB/sec +++
ttcp-t: 2048 I/O calls, msec/call = 3.60, calls/sec = 284.52
ttcp-t: 0.0user 5.1sys 0:07real 71% 0i+0d 0maxrss 0+2pf -12+51csw
# 
---
so at least it's faster than 10Mb/s ;-)

> Is it possible that they is not performing up to their
> specification because of low bus frequency,
> competitions or slow IRQ response?

There is some implementation issue (there are too many extra
cache flush, tulip Ethernet doesn't handle unaligned RX buffer etc.),
but a slower IDE disk/interface might be most problematic on usual ops.

Some extra kernel options (DIAGNOSTIC, DEBUG, LOCKDEBUG, KMEMSTATS etc)
also make kernel much slower, BTW.
---
Izumi Tsutsui