SGI 320 - USB Mouse Pointer Lag when Modem Active

SGI 320 - USB Mouse Pointer Lag when Modem Active

Post by David Pete » Tue, 15 Mar 2005 20:53:52


With our SGI Visual Workstation 320 there is a lag of about half a
second before the mouse pointer follows every time when the mouse is
being started to move -- when the internal Acer Surf PCI V90 modem is
online. The modem uses IRQ 6, and additionally the modem connection
seems quite sluggish.

Mouse response once the pointer has started to move is alright, and
there is no CPU load problem or the like.

The other day I tried to optimize MTU settings for the modem, using
MTUSpeed - but then mouse response became even worse, like more than one
second lag before the pointer starts following the mouse movement.

I have to add that a basic MS optical USB mouse, connected via active
4-port USB hub is used with this SGI 320. At the moment I have no access
to the SGI to test whether the same thing happens with the SGI mouse, or
when not using the USB hub.

Since the internal SGI USB ports seem to be quite problematic I once
tried to add a quality 4-port PCI USB 2.0 card. But then the SGI would
not even react to power button presses anymore - possibly a problem with
the power supply.

Any similar experiences - will I have to change the power supply, then
add the PCI USB hub to get rid of this problem?

Thanks, David.P

PS: OS is W2kSP4
 
 
 

SGI 320 - USB Mouse Pointer Lag when Modem Active

Post by Benjamin G » Wed, 16 Mar 2005 23:58:05


Looks like an IRQ conflict or an modem driver that is unable to do IRQ
sharing correctly...


Also points toward an IRQ conflict or a modem driver that is unable to do
IRQ sharing correctly...


Perhaps You first should try to assign a different IRQ to Your modem, either
in the device properties or (if that's not possible) by putting the modem in
another PCI slot...

Your problem really looks like an IRQ problem or a driver that is unable to
do IRQ sharing correctly. A new PSU won't help You as won't a PCI USB hub...

I don't know the modem, but there also is a good chance that the modem
simply is crap...

Benjamin

 
 
 

SGI 320 - USB Mouse Pointer Lag when Modem Active

Post by David Pete » Thu, 17 Mar 2005 02:17:55


Thanks Benjamin. I'll do as proposed and will report about any
perceptions as soon as I get hold of the machine again.

On the other hand I'd really like to have some more (and better working)
USB ports. Do you think that the power problem (SGI not powering up
anymore after the PCI USB card is built in) by any chance could be
solved by exchanging the PSU?

Btw, sometimes the system can't be powered on even whithout the modem
and then the power has to be unplugged for some minutes before the SGI
would power on again.

Thanks again,

David.P
 
 
 

SGI 320 - USB Mouse Pointer Lag when Modem Active

Post by Benjamin G » Thu, 17 Mar 2005 03:28:09


Maybe. But I had the exactly same problem with a cheap USB PCI card in an HP
i2000 Itanium workstation (same like SGI 750). No power with inserted card.
The card worked fine in other systems, though.


Try it w/o Modem and USB card. If the problem persists I really would
exchange the PSU, preferrably with a better generic ATX type...

Benjamin
 
 
 

SGI 320 - USB Mouse Pointer Lag when Modem Active

Post by David Pete » Fri, 18 Mar 2005 00:38:28


Thanks again. I got myself a professional Devolo MicroLink 56k i and
one :(expensive) Adaptec PCI-USB controller.

I'll report whether there was more luck with these devices.

David.P
 
 
 

SGI 320 - USB Mouse Pointer Lag when Modem Active

Post by davec6336 » Sat, 19 Mar 2005 14:53:54


would

I hope it does work because there is no "generic ATX type" PSU
that's going to go into a 320 without some serious rewiring to SGI's
320 ATX spec. You'll also need different connectors, 1 molex, one
smaller one. If you do go this route there is a wiring diagram
available on the mirror of Milton's old 320 site.
Also, don't even think about the snazzy UltraX Connect with the
power cables you plug in yourself. There's only about 2-1/2" clearance
between the PSU and the back of the 3.5" floppy to begin with and the
floppy connector on this puppy is a good 1-1/4" long with very rigid
cable. Not that it can't be done, but you'll have to seriously crimp
the cable and you will dust your knuckles up right fine.
Dave
 
 
 

SGI 320 - USB Mouse Pointer Lag when Modem Active

Post by silas.deny » Mon, 04 Apr 2005 21:26:19


The VW320 PCI ports are 3.3v rather than the much more common 5v
variety. Did your PCI USB 2.0 card operate at this lower voltage? If
not then I don't see any prospect of it working, and it may simply
have crashed the PCI bus preventing startup.

Regards

Silas
 
 
 

SGI 320 - USB Mouse Pointer Lag when Modem Active

Post by Tony 'Nico » Tue, 05 Apr 2005 03:12:05

In article < XXXX@XXXXX.COM >,


: The VW320 PCI ports are 3.3v rather than the much more common 5v
: variety. Did your PCI USB 2.0 card operate at this lower voltage? If
: not then I don't see any prospect of it working, and it may simply
: have crashed the PCI bus preventing startup.

It would have been keyed wrong and would not have fit in the slot.


Cheers - Tony 'Nicoya' Mantler :)

--
Tony 'Nicoya' Mantler -- Master of Code-fu -- XXXX@XXXXX.COM
-- http://www.yqcomputer.com/ ://www.ubb.ca/ --
 
 
 

SGI 320 - USB Mouse Pointer Lag when Modem Active

Post by Benjamin G » Sun, 10 Apr 2005 02:13:58


Show me a USB2 chipset that does not support 3.3V...

Benjamin
 
 
 

SGI 320 - USB Mouse Pointer Lag when Modem Active

Post by Tony 'Nico » Sun, 10 Apr 2005 03:47:22

In article < XXXX@XXXXX.COM >, "Benjamin Gawert" < XXXX@XXXXX.COM >



:
: > The VW320 PCI ports are 3.3v rather than the much more common 5v
: > variety. Did your PCI USB 2.0 card operate at this lower voltage?
:
: Show me a USB2 chipset that does not support 3.3V...

Ok:
< http://www.yqcomputer.com/ ;

Mind you, the slot keying would prevent you from inserting it in a 3.3v slot.


Cheers - Tony 'Nicoya' Mantler :)

--
Tony 'Nicoya' Mantler -- Master of Code-fu -- XXXX@XXXXX.COM
-- http://www.yqcomputer.com/ ://www.ubb.ca/ --
 
 
 

SGI 320 - USB Mouse Pointer Lag when Modem Active

Post by Benjamin G » Mon, 11 Apr 2005 16:21:35


Well, the VIA chipset does support 3.3V...

BTW: 17.99$ for this card is pure rip-off, isn't it? Especially with the
crappy VIA chipset. These cards usually go for a few bucks...


Right, because the card manufacturer didn't provide the 3.3V key on the PCI
connector. But then, as You said, the card also won't fit into the SGI320s
PCI slot.

Silas assumed that the card which the OP uses doesn't support 3.3V. But this
can't be the case since all USB2 chipset support 3.3V, and the card also
seems to have the correct keying (otherwise the OP wouldn't be able to
insert it in the 320).

Benjamin
 
 
 

SGI 320 - USB Mouse Pointer Lag when Modem Active

Post by Tony 'Nico » Tue, 12 Apr 2005 03:45:40

In article < XXXX@XXXXX.COM >, "Benjamin Gawert" < XXXX@XXXXX.COM >


: BTW: 17.99$ for this card is pure rip-off, isn't it? Especially with the
: crappy VIA chipset. These cards usually go for a few bucks...

The price is in canadian, and not terribly out of line with other 5-port USB2
cards.

< http://www.yqcomputer.com/ +5-port> (prices in $us)


Cheers - Tony 'Nicoya' Mantler :)

--
Tony 'Nicoya' Mantler -- Master of Code-fu -- XXXX@XXXXX.COM
-- http://www.yqcomputer.com/ ://www.ubb.ca/ --