qemu-devel
[Top][All Lists]
Advanced

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Qemu-devel] OpenBSD sched_yield() calls increase


From: Sai Prajeeth
Subject: [Qemu-devel] OpenBSD sched_yield() calls increase
Date: Fri, 5 Jun 2015 16:33:23 +0530

Hi list,

When running OpenBSD on QEMU without KVM, I see an increase in the number of sched_yield() system calls in certain multi-threaded benchmarks (sysbench). However while using KVM accelerator, the number of this system calls is minimal. Does any have any insight why this is happening? The execution of the benchmark is really slowed when not using KVM which is to be expected but why is there such as massive increase in sched_yield system calls? Moreover when using icount the number of sched_yield calls is further increased.

Some Number:

With KVM accelerator - #of sched_yields = 500
Using TCG - #of sched_yields = 2600
Using icount - #of sched_yields = 16000

Anyone has an idea why this might be happening?

Thank you!
  

reply via email to

[Prev in Thread] Current Thread [Next in Thread]