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SubjectRe: USB broken in 2.4.4? Serial Ricochet works, USB performance sucks.
On Wed, May 09, 2001 at 11:25:26PM -0700, clameter@lameter.com wrote:
> On Wed, 9 May 2001, Greg KH wrote:
>
> > On Wed, May 09, 2001 at 11:09:36PM -0700, clameter@lameter.com wrote:
> > >
> > > Allright then you should first check why the ACM driver is unable to
> > > handle an MTU of 1500. I had to set it to 232 or 500 to make it work at
> > > all. With an MTU of 1500 it does ICMP but not long tcp packets. There is
> > > some issue with long packets that might exceed some buffer size(?).
> >
> > I don't see anything in the ACM driver that would cause a problem for
> > large MTU settings. It is probably a device limitation, not the driver.
>
> The Richochet USB stuff uses generic serial I/O. No special driver. And it
> works fine under Win/ME. Have you run a regular PPP connection over the
> ACM driver with an MTU of 1500?

Joey Hess had a problem similar to what you described, though he noticed
it while using the pcmcia ricochet modem. He passed along this patch:


--- Serial.c.orig Fri Feb 2 12:55:44 2001
+++ serial.c Fri Feb 2 12:56:43 2001
@@ -569,10 +569,16 @@

icount = &info->state->icount;
do {
-
+ /*
+ * Check if flip buffer is full -- if it is, try to
flip,
+ * and if flipping got queued, return immediately
+ */
+ if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
+ tty->flip.tqueue.routine((void *) tty);
+ if (tty->flip.count >= TTY_FLIPBUF_SIZE)
+ return;
+ }
ch = serial_inp(info, UART_RX);
- if (tty->flip.count >= TTY_FLIPBUF_SIZE)
- goto ignore_char;
*tty->flip.char_buf_ptr = ch;
icount->rx++;

--
Drew Bertola | Send a text message to my pager or cell ...
| http://jpager.com/Drew
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