Subject: Re: [linux-audio-dev] It's time to vote (n. 1)
From: John Lazzaro (lazzaro_AT_CS.Berkeley.EDU)
Date: Thu May 24 2001 - 03:15:02 EEST
> I'm just wondering, since I'm getting a .7 ms roundtrip time when
> pinging my other Linux system here, which is connected to this one
> by 100 Mbps ethernet through a 100 Mbps switch. Is that number
> for real? Because it seems almost too good.
Yes it is -- see the Stanford-Berkeley RTT's in Section 8.5 of the
paper links I sent along to the newsgroup earlier today; those are
going through 24 hops round-trip (see traced route in Table 2),
yet the total RTT is 3.6 ms -- subtract out speed of light across
the Bay and back, and there isn't that much time left for those
24 boxes to do their thing :-).
Of course, that measurement is 60 measurements done at 1-second
intervals, taken during an uncongested minute -- that's why
the standard deviation in the table is so low. Pick a period
with intense congestion, and its a whole different story (see
Table 5 and Section 8.4 to get a feel ...).
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John Lazzaro -- Research Specialist -- CS Division -- EECS -- UC Berkeley
lazzaro [at] cs [dot] berkeley [dot] edu www.cs.berkeley.edu/~lazzaro
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