I've found a minor bug in the ppp driver. The value of tx_queue_len was
set to 0. The problem is that the current networking code
will just drop a packet on the floor if there is no "room" in the
device queue when it tries to put it into the queue. Since the queue
is just a linked list I didn't see any problems with making the value
of tx_queue_len non-zero. [This is the case in pretty much all the
other networking drivers.] In any case this improves the full bore
TCP speed across my PPP link by about 10%.
-- eric
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Eric Schenk www: http://www.cs.toronto.edu/~schenk
Department of Computer Science email: schenk@cs.toronto.edu
University of Toronto
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diff -u -r linux-1.99.4/drivers/net/ppp.c linux/drivers/net/ppp.c
--- linux-1.99.4/drivers/net/ppp.c Thu May 16 04:57:57 1996
+++ linux/drivers/net/ppp.c Fri May 17 01:31:56 1996
@@ -400,6 +400,7 @@
dev->get_stats = ppp_dev_stats;
dev->do_ioctl = ppp_dev_ioctl;
dev->addr_len = 0;
+ dev->tx_queue_len = 10;
dev->type = ARPHRD_PPP;
for (indx = 0; indx < DEV_NUMBUFFS; indx++)
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