[nycbug-talk] NIC Device Polling in FreeBSD

[Mark Saad]

George 
  Thanks for the info, can you elaborate more on what a good or bad work load
would be. Is there any rule of thumb like a SQL server is a bad place to use polling,
and a high traffic nfs server is a good place , or is this more complicated. 
Also is there any harm in deploying a kernel with Polling enabled but 
the nic not configured to use it? 




----- Original Message ----
> From: George Neville-Neil <gnn at neville-neil.com>
> To: Mark Saad <mark.saad at ymail.com>
> Cc: nycbug <talk at lists.nycbug.org>
> Sent: Sat, October 17, 2009 3:51:36 PM
> Subject: Re: [nycbug-talk] NIC Device Polling in FreeBSD
> 
> 
> On Oct 15, 2009, at 17:44 , Mark Saad wrote:
> 
> > Hello Talk
> >  Does anyone know off hand why "options DEVICE_POLLING" is still not in the 
> GENERIC FreeBSD kernel ?
> > I understand that it does not work with every card, but is there any issue 
> with a kernel having polling enabled and the device not using it ?
> 
> I believe this is at least in part due to not wanting to surprise users.  Only 
> certain workloads
> do well with polling enabled, and so it's considered a tuning nob for experts 
> not something
> to be automagically turned on.
> 
> Best,
> George


 --
Mark Saad
mark.saad at ymail.com