Re: Timings for optimised poll(2)
H. Peter Anvin (hpa@transmeta.com)
25 Aug 1997 07:32:50 GMT
Followup to: <19970825021047.27364.qmail@mail.ocs.com.au>
By author: Keith Owens <kaos@ocs.com.au>
In newsgroup: linux.dev.kernel
> >
> >Without having access to any Pentium computer, I find it difficult
> >to believe that you got 1.5 us with your test program?! If you did,
> >could you give a point of view as to why you think the numbers are
> >so different?
>
> 386DX/40 ISA 27,700 us (2.0.30)
> 486DX2/66 ISA 12,000 us (2.0.30)
> P100 PCI 1,600 us (2.0.30)
> P166 (dual) PCI 1,300 us (2.1.51)
>
> Binary compiled with -O2 on P166, copied to other systems. Suspect
> cache effect.
>
Sounds like someone confused µs and ms... (1,500 µs == 1 ms)?
-hpa
--
PGP: 2047/2A960705 BA 03 D3 2C 14 A8 A8 BD 1E DF FE 69 EE 35 BD 74
See http://www.zytor.com/~hpa/ for web page and full PGP public key
Always looking for a few good BOsFH. ** Linux - the OS of global cooperation
I am Baha'i -- ask me about it or see http://www.bahai.org/