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

[Lincoln Dale]

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.

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