Ingo Molnar wrote:
>
> On Wed, 17 Jan 2001, Rick Jones wrote:
>
> > i'd heard interesting generalities but no specifics. for instance,
> > when the send is small, does TCP wait exclusively for the app to
> > flush, or is there an "if all else fails" sort of timer running?
>
> yes there is a per-socket timer for this. According to RFC 1122 a TCP
> stack 'MUST NOT' buffer app-sent TCP data indefinitely if the PSH bit
> cannot be explicitly set by a SEND operation. Was this a trick question?
> :-)
Nope, not a trick question. The nagle heuristic means that small sends
will not wait indefinitely since sending the first small bit of data
starts the retransmission timer as a course of normal processing. So, I
am not in the habit of thinking about a "clear the buffer" timer being
set when a small send takes place but no transmit happens.
rick jones
btw, as I'm currently on linux-kernel, no need to cc me :)
-- ftp://ftp.cup.hp.com/dist/networking/misc/rachel/ these opinions are mine, all mine; HP might not want them anyway... :) feel free to email, OR post, but please do NOT do BOTH... my email address is raj in the cup.hp.com domain... - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Tue Jan 23 2001 - 21:00:18 EST