Core Mask for Multicore Performance about moongen

[emmericp]

The l2 script only uses a single core by default, but you can just start more threads.
You are supposed to modify the example scripts to fit your needs. Adding more threads here is trivial, duplicating a single line is sufficient.

btw: such a low performance indicates that your system doesn't support cache access for the NIC; l2-load-latency achieves line rate even on relatively slow CPUs with < 2ghz usually.

[emmericp]

see lua/dpdk-conf.lua

[wenhuizhang]

Got you , thanks so much !

On Thu, Oct 29, 2015 at 7:40 PM, Paul Emmerich [email protected]
wrote:

Closed #99 #99.

—
Reply to this email directly or view it on GitHub
#99 (comment).

V/R,

Wenhui Zhang

Email: [email protected]
Telephone: [phone]

[wenhuizhang]

Hi, sorry for bothering, yet is there anyway to improve Moongen Performance, I think I used all 16 cores, by cores = 0xffff.

[wenhuizhang]

Hmm, I am using a 16 cores with 2.4Ghz CPU, I think I enabled two cores for cache access as we can see below,

wenhui@nimbnode16:~/MoonGen$ cpuid | grep -i dca
PLATFORM_DCA_CAP MSR bits = 1
PLATFORM_DCA_CAP MSR bits = 0
PLATFORM_DCA_CAP MSR bits = 0
PLATFORM_DCA_CAP MSR bits = 0
PLATFORM_DCA_CAP MSR bits = 0
PLATFORM_DCA_CAP MSR bits = 0
PLATFORM_DCA_CAP MSR bits = 0
PLATFORM_DCA_CAP MSR bits = 0
PLATFORM_DCA_CAP MSR bits = 1
PLATFORM_DCA_CAP MSR bits = 0
PLATFORM_DCA_CAP MSR bits = 0
PLATFORM_DCA_CAP MSR bits = 0
PLATFORM_DCA_CAP MSR bits = 0
PLATFORM_DCA_CAP MSR bits = 0
PLATFORM_DCA_CAP MSR bits = 0
PLATFORM_DCA_CAP MSR bits = 0

[emmericp]

DPDK does not support DCA, only DDIO which is more annoying to fix if it doesn't work.
Just use more threads.

[wenhuizhang]

By multithreading, does it mean that run more slaves please? like copying L43 several times? which does not work in this case... "https://github.com/emmericp/MoonGen/blob/master/examples/l3-load-latency.lua#L43", should I use other scripts as base?

[emmericp]

okay, you'll also need to increase the number of queues. but that's another trivial change.