Re: 1352 NUL bytes at the end of a page? (was Re: Assertion `s && s->tree' failed: The saga continues.)

Lincoln Dale
2004-05-15T03:16:38Z

At 02:53 AM 15/05/2004, Andy Isaacson wrote:
>That corruption size really does make me think of network packets, so
>I'm tempted to blame it on PPP. Can you find out the MTU of your PPP
>link? "ifconfig ppp0" or something like that.

1352 bytes coule be remarkably close to the TCP MSS . . .
perhaps there is some interaction with ppp where there is an overrun / lost
packet and the TCP window is mistakenly advanced?

i.e.
- 1500 byte MTU
- less 28 bytes for PPP header (1472 bytes)
- less 20 bytes for IP header (1452 bytes)
- less 20 bytes for TCP header (1432 bytes)

if, however, the MRU is actually negotiated to be 1420 rather than 1500 . . .

when you issue the "bk pull", it may be interesting to see the output from:
tcpdump -i ppp0 -n | grep mss

cheers,

lincoln.