Linux-kernel mailing list archive 1999-36,: Re: bug in linux 2.2.10 and 2.2.12 ip or network layer

# Re: bug in linux 2.2.10 and 2.2.12 ip or network layer

Frank Sweetser (rasmusin@WPI.EDU)
Fri, 10 Sep 1999 16:20:30 -0400 (EDT)

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==> Regarding Re: bug in linux 2.2.10 and 2.2.12 ip or network layer; Thomas Gschwendtner <tgs@bu.edu> adds:

tgs> Alan Cox wrote:
>> > So... BPF samples the packets before they hit the ethernet on the
>> local > machine, isn't that right? And therefore, tcpdump on the local
>> machine
>>
>> Yes but they may still be lost because the ethernet is full so they fall
>> out of the send queue. That isnt infinite either.
>>
tgs> I'm not sure if I understand this right. Once a packet leaves the TCP
tgs> layer and it can not be passed to the ethernet hardware immediately,
tgs> the packet is not buffered, it is discareded?! Is that right? Why can
tgs> it not stay in some sk_buff list? When there is no more system memory
tgs> available, then the send system call will block and therefore there
tgs> should be always enaugh memory to buffer the packet for a wile.

http://paramount.ind.wpi.edu/~rasmusin/papers/congavoid.ps.gz

    --
    Frank Sweetser rasmusin at wpi.edu fsweetser at blee.net  | PGP key available
    paramount.ind.wpi.edu RedHat 5.2 kernel 2.2.5        i586 | at public servers
    > A 386sx16 with 3M of ram is noticeable slower than a PPro200 with 256MB of
    > ram
    Film at 11.
    		Linus

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