Re: Making IFQ_MAXLEN tunable

On 4/30/10 1:23 PM, Maxim Sobolev wrote:
> Hi,
>
> Many network drivers in the FreeBSD kernel use the IFQ_MAXLEN value to
> set length of the outgoing packets queue. The default value for that
> parameter is only 50, which is pretty low especially for the cases when
> the system handles lot of small packets and can cause ENOBUFS in
> applications under the load. The following patch makes IFQ_MAXLEN a
> tunable. I am also tempted to bump the default value for IFQ_MAXLEN
> 10-fold, but would like to hear what do people think about it first.
>
> http://sobomax.sippysoft.com/IFQ_MAXLEN.diff
>
> -Maxim
> _______________________________________________
> freebsd-net_at_freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-net
> To unsubscribe, send any mail to "freebsd-net-unsubscribe_at_freebsd.org"

so just tunable? not a sysctl :-)


patch could be a lot smaller if you defined IFQ_MAXLEN to be 
V_ifqmaxlen (do different vimages want a different value?)