[dpdk-dev] running dpdk application on the same machine with other none dpdk application

[Shirley Avishour]

Hi Rami,

This is the printout for cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-4.15.0-43-generic
root=UUID=6f1a210b-a30f-456d-bf16-bbb210da5666 ro default_hugepagesz=2M
hugepagesz=2M hugepages=4096 isolcpus=1-5 nohz_full=1-5 rcu_nocbs=1-5

The requires cpus are in fact isolated but jvm generate some kernel threads
as well and I'm afraid that these kernel space threads eventually use all
cores. isolcpus is not applies on kernel space threads.

Shirley.



On Wed, Jan 30, 2019 at 8:57 AM Rami Rosen <ramirose at gmail.com> wrote:

> Hi Shirley,
> >Running java based applications on the same server with a dpdk based
> application has an impact on the dpdk performance.
> Probably since the JVM generates kernel based processes. I
>
> This is true, but as far as I know, using isolcpus should prevent these
> processes to run on the isolated cores.
>
> Just to be on the safe side: did you make sure with cat /proc/cmdline on
> the kernel you are actually running indeed
> has the "isolcpus=1-5" you added in grub ? sometimes, especially in multi
> OS hosts, adding entries in /etc/default/grub and running grub2-mkconfig is
> not enough, if you boot from a different partition.
>
> Regards,
> Rami Rosen
>
>
>