Messages in this thread | | | Subject | Re: [PATCH 1/4] softirq: implement IRQ flood detection mechanism | From | Bart Van Assche <> | Date | Wed, 4 Sep 2019 10:38:59 -0700 |
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On 9/4/19 10:31 AM, Daniel Lezcano wrote: > On 04/09/2019 19:07, Bart Van Assche wrote: >> Only if CONFIG_IRQ_TIME_ACCOUNTING has been enabled. However, I don't >> know any Linux distro that enables that option. That's probably because >> that option introduces two rdtsc() calls in each interrupt. Given the >> overhead introduced by this option, I don't think this is the solution >> Ming is looking for. > > Was this overhead reported somewhere ? I think it is widely known that rdtsc is a relatively slow x86 instruction. So I expect that using that instruction will cause a measurable overhead if it is called frequently enough. I'm not aware of any publicly available measurement data however.
Bart.
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