Device polling

Ruslan Ermilov ru at
Sun Jun 13 18:13:58 GMT 2004

On Sun, Jun 13, 2004 at 01:07:28PM -0500, Jon Noack wrote:
> I just tested this on my SMP all-in-one home server (Web, Mail, NFS, 
> Samba, Squid, etc.).  It's been up for over 24 hours with no apparent 
> issues.  The machine is used pretty heavily, with NFS mounted home 
> directories and CVS mirror (see below) -- a CVS update of the src tree 
> over NFS has done a good job of breaking fragile setups in the past. 
> Everything seemed OK.  That said, peak performance (as tested by iperf) 
> took a nosedive: with 32-bit em adapters (gige), tcp bandwidth dropped 
> from over 360Mbps to around 200 Mbps.  If anyone has any suggestions for 
> more in-depth testing, I'd be willing to try them.  If I have the time I 
> may also try the latest netperf patch and see how that affects things.
What are your operational polling(4) parameters?  What the HZ is set to?

Ruslan Ermilov
ru at
FreeBSD committer
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