liujian (CE) <[email protected]> wrote:
[ trimming cc list ]
> Now, I have not the real environment.
> I use iperf generate fragment packets;
> and I always change NIC rx irq's affinity cpu, to make sure frag_mem_limit
> reach to thresh.
> my test machine, CPU num is 384.
Oh well, that explains it.
> > > + if (frag_mem_limit(nf) > nf->low_thresh) {
> > > inet_frag_schedule_worker(f);
> > > + update_frag_mem_limit(nf, SKB_TRUESIZE(1500) * 16);
> > > + }
You need to reduce this to a lower value.
Your cpu count * batch_value needs to be less than
low_thresh to avoid problems.
Wtih 384 cpus its close to 12 mbyte...
Perhaps do this:
update_frag_mem_limit(nf, 2 * 1024*1024 / NR_CPUS);
However, I think its better to revert the percpu counter change and
move back to a single atomic_t count.
