Re: gettimeofday() in hping

Hi,

Dag-Erling Sm=C3=B8rgrav wrote:
> Stefan Lambrev <[e-mail]> writes:
>  =20
>> I tested all different combination. The performance change is almost
>> invisible (100-200KB/s), and can't be compared with the performance
>> boost that TSC gain over ACPI-fast timecounter.  Unfortunately TSC
>> doesn't play nice with power saving modes.
>>    =20
>
> This will vary greatly from machine to machine, depending on the exact
> hardware and the ACPI BIOS.
>
> More modern machines have an HPET timer which is supposedly faster than=

> ACPI yet more reliable than TSC.
>
> DES
>  =20
I do not have HEPT on the servers that I test, but simple test on my=20
laptop shows
that hping can generate with ACPI-fast ~4MB/s traffic, 5MB/s with HPET
and 8MB/s with TSC. I didn't check dummy time counter.
Also I noticed that there is a kern.timecounter.tc.XXX.quality (read only=
).
Can this be used to reduce quality and speed up performance?

--=20

Best Wishes,
Stefan Lambrev
ICQ# 24134177


_______________________________________________
[e-mail] mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-hackers
To unsubscribe, send any mail to "[e-mail]"