Re: "failed to reclaim memory" with much free physmem

On Fri, Sep 12, 2025 at 6:35 PM Garrett Wollman <wollman@bimajority.org> wrote:
>
> <<On Fri, 12 Sep 2025 18:29:30 -0700, Rick Macklem <rick.macklem@gmail.com> said:
>
> > Lets see, 50% of memory allocated to mbufs and 99.9%
> > of physical memory allowed for the arc.
> > - This reminds me of the stats CNN puts up, where the
> >   percentages never add up to 100.
>
> The point being that the ARC is supposed to respond to backpressure
> long before memory runs out.  And again, we're talking about a system
> with 100 GiB of outright FREE physical memory.  There's no possible
> way that can be fully allocated in less than 5 minutes -- the NICs
> aren't that fast and the servers aren't doing anything else.
I don't recall you mentioning your NIC speed, but 10Gbps->about 1Gbyte/sec.
That's 100sec. But you certainly could be correct.

rick

>
> -GAWollman
>