On Tue, Jul 31, 2001 at 11:41:24PM -0400, Charles Sprickman wrote:
> On Tue, 31 Jul 2001, Ryan O'Connell wrote:
>
> > Because it takes time for the BSD boxes to process the packets at each
> > end then send the packets to the network card for transmission. The
> > RTT measured by ping includes time spent in the local and remote IP
> > stacks.
>
> FreeBSD isn't that sloppy. Here's one FreeBSD host pinging another on a
> full duplex 100Mb network. Both boxes use the fine Intel Pro100 chipset,
> a.k.a. fxp. Not a Cisco switch, but an HP2424 (which oddly enough speaks
> CDP):
[snip]
> The original poster was getting 1ms+ on this sized packet! Something
> seems wrong.
There's probably lots of variation between different kernels and hardware
architectures with respect to timing granularity, how long it takes to copy
the packet around etc. I see about 1.1ms on my Intel Linux box to a local
router, I'd imagine *BSD would probably give similar results on the exact
same hardware.
I certainly wouldn't view 1.2ms as being bad in any way, as long as the
througput of the connection (Measured with a "clean" protocol such as FTP)
is OK.
-- Ryan O'Connell - <ryan@complicity.co.uk> - http://www.complicity.co.ukI'm not losing my mind, no I'm not changing my lines, I'm just learning new things with the passage of time
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