Pieter de Goeje wrote:
On Friday 03 October 2008, Bartosz Stec wrote:
Hello again :)
With POLLING enabled I experience about 10%-25% performance drop when
copying files over network. Tested with both SAMBA and NFS. Is it normal?
Yes. You don't want to use polling unless you set kern.hz to 10000 or
something in that range.
HZ = 1000 or 2000 is fine for most purposes, at least up through T3 level
bandwidth. For a home LAN or small business office of a half-dozen machines
using DSL/Cable (~ 1-5 MBs up), even a P2-300 or VIA C3 600 at HZ=250 works OK
as a firewall/router. The main thing that using polling does is that it adds
a reasonably fixed amount of latency (ie, the poll interval) but gives solid
processing performance even under heavy load, just as you say:
If you have a NIC with interrupt moderation, polling
should almost never be necessary. Note that polling can still be useful for
routers, because it allows you to have a much more responsive system even
when handling heavy network traffic.
Note that he's got the link0 flag going, so that should mean he's using
firmware with the fxp NIC which does interrupt moderation.
Regards,
--
-Chuck
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