Re: [linux-usb] Re: Irq context wrong for USB ACM serial driver calling PPP?

From: Jamie Lokier (lu@tantalophile.demon.co.uk)
Date: Mon Mar 06 2000 - 19:25:18 EST


Vojtech Pavlik wrote:
> > ACM still works, my connection seems to have similar wet string
> > functionality, and all the "kfree_skb on hard IRQ" messages have gone
> > away.
>
> Wet string? Could you describe the problem better? I'd like to know if
> there's anything wrong with ACM ... Pavel has reported massive system
> slowdown with using JE's UHCI (due to bandwith reclamation), is it
> that?

Bandwidth reclamation is turned off, but I am using JE's UHCI. My
system seems ok, it's just the modem connection that's slow.

The TCP session is very conditional. Press a key, wait 5 seconds for
display update. Here are some ping times. It could be my ISP today, or
maybe the LAN at the far end is overloaded today.

I only noticed since I went from 2.3.40 to 2.3.49 recently.

64 bytes from xx.xx.xx.xx: icmp_seq=10 ttl=241 time=270.0 ms
64 bytes from xx.xx.xx.xx: icmp_seq=11 ttl=241 time=730.0 ms
64 bytes from xx.xx.xx.xx: icmp_seq=12 ttl=241 time=300.0 ms
64 bytes from xx.xx.xx.xx: icmp_seq=13 ttl=241 time=320.0 ms
64 bytes from xx.xx.xx.xx: icmp_seq=14 ttl=241 time=760.0 ms
64 bytes from xx.xx.xx.xx: icmp_seq=15 ttl=241 time=540.0 ms
64 bytes from xx.xx.xx.xx: icmp_seq=16 ttl=241 time=880.0 ms
64 bytes from xx.xx.xx.xx: icmp_seq=17 ttl=241 time=790.0 ms
64 bytes from xx.xx.xx.xx: icmp_seq=18 ttl=241 time=250.0 ms
64 bytes from xx.xx.xx.xx: icmp_seq=19 ttl=241 time=460.0 ms
64 bytes from xx.xx.xx.xx: icmp_seq=20 ttl=241 time=380.0 ms
64 bytes from xx.xx.xx.xx: icmp_seq=21 ttl=241 time=280.0 ms
64 bytes from xx.xx.xx.xx: icmp_seq=22 ttl=241 time=170.0 ms
64 bytes from xx.xx.xx.xx: icmp_seq=23 ttl=241 time=280.0 ms
64 bytes from xx.xx.xx.xx: icmp_seq=24 ttl=241 time=160.0 ms
64 bytes from xx.xx.xx.xx: icmp_seq=25 ttl=241 time=180.0 ms
64 bytes from xx.xx.xx.xx: icmp_seq=26 ttl=241 time=170.0 ms
64 bytes from xx.xx.xx.xx: icmp_seq=27 ttl=241 time=500.0 ms
64 bytes from xx.xx.xx.xx: icmp_seq=28 ttl=241 time=220.0 ms

-- Jamie

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