Ascend Archive
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Re: (ASCEND) Quake and latency on Ascend
On Tue, Aug 12, 1997 at 03:19:04PM +1200, Josh Bailey wrote:
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> On Mon, 11 Aug 1997, bcurnow wrote:
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> > The question. Which is better: Dropping overflow packets immediately, or
> > buffering them for God knows how many seconds?
>
> Personal opinion - since we're doing UDP here - it'd be better to drop
> them. Gives the application (in this case Quake) a better chance to do the
> flow control/buffering, something the data link layer shouldn't touch.
Best option IMHO would be to make this TOS dependend: If the Reliability
Flag in the TOS is set, better queue them. If it is not, drop them. Quake
will likely not set this flag. Quake may, however, set the Delay flag in
order to get lower delays. Which leads to a general question on Ascend
equipment: Is TOS handling implemented at all, and if so, how ? Will
small packets with the Delay flag be sorted into the queues with privi-
lege ? Is Reliability considered on dropping ? Is Throughput somehow used,
f.i. in creating oversized packets on the WAN ? And is the Preference value
somehow utilized as a priority in queuing ?
Now, on the other hand, you won't very likely play Quake and download
the newest Quake2 Shareware 30 MByte in the background ;->
> Ie. if the packets can't be forwarded because the Max is too busy - the
> Max should drop them and get on with forwarding traffic rather than
> chewing up buffers.
Generally, yes. But not if I explicitly request it to take caution, with
TOS Reliability.
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