[kwlug-disc] Syscall load?

[Khalid Baheyeldin]

On Wed, Sep 3, 2025 at 6:31 AM Chris Frey <cdfrey at foursquare.net> wrote:

> On Wed, Sep 03, 2025 at 06:07:17AM -0400, Khalid Baheyeldin wrote:
> > On Wed, Sep 3, 2025, 02:32 Chris Frey <cdfrey at foursquare.net> wrote:
> >
> > > What about syscall load?
> > >
> >
> > Do you mean as reported by the time command?
> > Or do you mean something else?
>
> I believe this would be reported by the strace command, tracking
> read and write syscalls.  My theory is that with a varying blocksizes,
> it will impact the number of trips into kernel space, and therefore
> CPU load.
>
> A fast machine may be able to keep up with, and saturate, available
> disk bandwidth.  So even with the same throughput, CPU load and syscall
> counts may differ.  If so, then a slower machine may care about blocksize.
>

That makes perfect sense: the more round trips into the kernel and out
the more CPU utilization.

I just thought that "syscall load" is a metric that can be displayed by some
utility, like load average, hence the question.

-- 
Khalid M. Baheyeldin
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