Messages in this thread Patch in this message | | | Date | Thu, 10 May 2001 20:07:50 -0700 | From | Drew Bertola <> | Subject | Re: USB broken in 2.4.4? Serial Ricochet works, USB performance sucks. |
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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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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