From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: andrew may <acmay@acmay.homeip.net>,
<linuxppc-embedded@lists.linuxppc.org>
Subject: Re: get_cycles/get_tbl on 405
Date: Fri, 24 Aug 2001 11:52:56 +0200 [thread overview]
Message-ID: <20010824095256.80@smtp.adsl.oleane.com> (raw)
In-Reply-To: <20010823185911.A3291@ecam.san.rr.com>
>I wanted to do some quick time measurements of some things on a driver
>running of the 405GP and I eneded up using get_tbl(). It seems like
>get_cycles should be the more standard way to get a tick count but
>it seems to return 0. I don't get the __ftr_fixup stuff in timex.h
>so I am not sure what it is trying to do differently from get_tbl.
The __ftr_fixup in timex.h adds a reference to this code in the
feature fixup section. This allow the code that access the TB to
be nop'ed out on CPUs that don't implement it (601)
Ben.
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2001-08-24 9:52 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-08-24 1:59 get_cycles/get_tbl on 405 andrew may
2001-08-24 9:52 ` Benjamin Herrenschmidt [this message]
2001-08-25 2:35 ` Dan Malek
2001-08-25 7:35 ` acmay
2001-08-27 17:56 ` Dan Malek
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