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 <ramir...@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 > > >
