Re: [dpdk-users] DPDK and isolcpus

[曾懷恩 <the@csie.io>]

Hi Filip,

Do you use Mellanox NIC?

In my experience, rte_lcore_count only counts those lcores that are not isolated when using mlx5 driver.

And Intel ixgbe counts lcores correctly even I use isolcpus flag

BR, 

Sent from my iPhone

> From: Filip Janiszewski <contact@filipjaniszewski.com>
> To: "users@dpdk.org" <users@dpdk.org>
> Subject: [dpdk-users] DPDK and isolcpus
> Message-ID:
>    <e98abf2a-b1cf-5fee-7929-778f70390d1d@filipjaniszewski.com>
> Content-Type: text/plain; charset=iso-8859-15
> 
> Hi,
> 
> I've configured a bunch of my box cores with isolcpus and nohz_full in
> the attempt to squeeze a little more performance out of them, but,
> apparently I can't use those core in DPDK anymore as it seems that
> rte_lcore_count reports only core which are not isolated, also I can't
> launch any thread (rte_eal_remote_launch) on those cores.
> 
> In my understanding
> (http://doc.dpdk.org/spp-18.02/setup/performance_opt.html) I should be
> able to "Use the isolcpus Linux kernel parameter to isolate them from
> Linux scheduler to reduce context switches. It prevents workloads of
> other processes than DPDK running on reserved cores with isolcpus
> parameter." but can't make it work.
> 
> Which is the correct way to bind DPDK threads to isolated cpus?
> 
> Thanks
> 
> -- 
> BR, Filip
> +48 666 369 823
> 
> 
> End of users Digest, Vol 196, Issue 5
> *************************************