🚀 go-pugleaf

Paul Dwerryhouse wrote:
> 
> Hi all,
> 
> I have just noticed, after running Linux for about a year and a half,
> that my serial throughput is absolutely dreadful, yet when running any
> other operating system, the throughput is fine.
> 
> It seems that under Linux, there are errors in many of the characters
> received, such that when a PPP link is run, an annoyingly high rate of
> packets are dropped:
> 
> ppp0      Link encap:Point-Point Protocol
>           inet addr:10.0.2.15  P-t-P:128.250.80.9  Mask:255.0.0.0
>           UP POINTOPOINT RUNNING  MTU:552  Metric:1
>           RX packets:5351 errors:126 dropped:126 overruns:0
>           TX packets:1340 errors:0 dropped:0 overruns:0
> 
> The above, at 2.3% bad packets, is actually one of my *better* rates. Normally
> it sits around 5-7% dropped packets, which seems to give an overall throughput
> of about 1.1kbytes per sec. as reported by ncftp or Netscape when used on a
> 28.8kbps link. Under any other operating system, I get around 3.1 or so kbytes
> per second.
>

I have my modem connected to com2 and a serial printer connected to
com4. 
For six months I had terrible ppp performance whilst printing to my
Apple LaserWriter. I finaly broke down and read the Serial-Howto. In it
I discovered that my serial ports were competing for the same interrupt. 
So I bit the bullet and changed by com4 interrupt. Haven't had a problem
since.

Now my ppp performance is quite good (about 25% faster than Windows 95).
I
get 3.0 Kbs under Linux and 2.5 Kbs under Windows 95. Dropped packets, I 
rarely get them.
 
Do another look around to see if something is competing for the IRQ.
Maybe it's
a PCI IDE controller eating up an IRQ for the PCI slot.

Hope that helps,
Rob