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    SubjectRe: [linux-usb] Re: Irq context wrong for USB ACM serial driver calling PPP?
    On Tue, Mar 07, 2000, Vojtech Pavlik <vojtech@suse.cz> wrote:
    > On Tue, Mar 07, 2000 at 01:25:18AM +0100, Jamie Lokier wrote:
    >
    > > > 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.

    Ummm. You can't turn it off for my UHCI driver, unless you hacked the
    driver? The AFS driver has a compile option tho.

    > > 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
    >
    > Well, this looks like a lightly loaded modem connection. Could you
    > please make sure the modem isn't used for anything but the ping
    > and ping the opposite point of the link only?
    >
    > Btw, there were no important changes between 2.3.40 and 2.3.49 in acm.c
    > that could be causing this (except to the wakeup stuff now, which could
    > delay data by up to 10 ms).

    JE


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