Subject: Re: DECchip 21143 and the tlp driver.
To: Brad Spencer <firstname.lastname@example.org>
From: Wolfgang Rupprecht <email@example.com>
Date: 10/29/1999 14:38:50
> I tried the above, but it didn't seem to matter. No amount of ifconfiging
> can cause the media type to change.
I just went to the console of my DFE-570TX machine and tried the
ifconfig. I can confirm that the adaptor itself stays in the
100baseTX mode while the kernel thinks it is now 10baseT.
Ping to a 10baseT host:
16008 bytes from 22.214.171.124: icmp_seq=0 ttl=0 time=29.370 ms
Ping to a 100baseTX host:
16008 bytes from 126.96.36.199: icmp_seq=0 ttl=0 time=3.858 ms
Since the pings to the 100baseTX host are ~10x faster, it looks like
the interface is still speaking 100BaseTX. Interesting.
> The fifo changes start to occure around the time that the quotas are being
> checked. The machine in question has 3 scsi busses on it, and a couple of
> them would be active checking the quotas. It appears that any amount of
> traffic at this time causes the fifos to adjust.
I can believe that 3 scsi buses would chew up all of one's PCI bandwidth.
I wonder if there is any pci bus coupler tweaking that can be done by
software to allow devices to get on and off the bus a bit faster.
Wolfgang Rupprecht <firstname.lastname@example.org> http://www.wsrcc.com/wolfgang/
DGPS signals via the Internet http://www.wsrcc.com/wolfgang/gps/dgps-ip.html