-- Regards, Serguei I. Ivantsov----- Original Message ----- From: "Der Herr Hofrat" <der.herr@mail.hofr.at> To: "Serguei I. Ivantsov" <administrator@svitonline.com> Cc: <linux-gcc@vger.kernel.org>; <linux-kernel@vger.kernel.org> Sent: Wednesday, May 08, 2002 3:00 PM Subject: Re: Measure time
> > Hello! > > > > Is there any function for high precision time measuring. > > time() returns only in second. I need nanoseconds. > > > you can directly read the TSC but that will not realy give you nanoseconds > resolution as the actual read access even on a PIII/1GHz is going to take > up to a few 100 nanoseconds, and depending on what you want to time > stamp the overall jitter of that code can easaly be in the > range of a microsecond. > > There are some hard-realtime patches to the Linux kernel that will > allow time precission of aprox. 1us (the TSC has a precission of 32ns) > but I don't think you can get below that without dedicated hardware. > > for RTLinux check at ftp://ftp.rtlinux.org/pub/rtlinux/ > > hofrat
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/