Limits on jumbo mbuf cluster allocation

[Jack Vogel]

How large are you configuring your rings Garrett? Maybe if you tried
reducing them?

Jack


On Mon, Mar 11, 2013 at 9:05 AM, Garrett Wollman <
wollman at hergotha.csail.mit.edu> wrote:

> In article <513DB550.5010004 at freebsd.org>, andre at freebsd.org writes:
>
> >Garrett's problem is receive side specific and NFS can't do much about it.
> >Unless, of course, NFS is holding on to received mbufs for a longer time.
>
> Well, I have two problems: one is running out of mbufs (caused, we
> think, by ixgbe requiring 9k clusters when it doesn't actually need
> them), and one is livelock.  Allowing potentially hundreds of clients
> to queue 2 MB of requests before TCP pushes back on them helps to
> sustain the livelock once it gets started, and of course those packets
> will be of the 9k jumbo variety, which makes the first problem worse
> as well.
>
> -GAWollman
>
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