> For ppc this only gives 32-bit values, which overflow every 129 seconds on my
> G5. Depending on how long you're trying to time, this could be a problem.
Just take an extra measure to "record" overflows (2^32-1 => 0) and you're set.
Jan Engelhardt
--
No TOFU for me, please.
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To
For ppc this only gives 32-bit values, which overflow every 129 seconds on my
G5. Depending on how long you're trying to time, this could be a problem.
Just take an extra measure to record overflows (2^32-1 = 0) and you're set.
Jan Engelhardt
--
No TOFU for me, please.
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To unsubscribe
Peter Chubb wrote:
"Chris" == Chris Friesen <[EMAIL PROTECTED]> writes:
Chris> Most cpus have some way of getting at a counter or decrementer
Chris> of various frequencies. Usually it requires low-level hardware
Chris> knowledge and often it needs assembly code.
As a device driver is inside the
>>>>> "Chris" == Chris Friesen <[EMAIL PROTECTED]> writes:
Chris> krishna wrote:
>> Hi All,
>>
>> Can any one tell me how to measure time accurately for a block of C
>> code in device drivers. For example, If I want to measure the tim
>In some cases you can simply count jiffies - depending on how accurate you
>need to time things I'd say that often something like this is adequate :
These "some cases" exclude this one:
If interrupts are disabled, a jiffy might be missed. Take care.
If you are on UP and want to measure within
On Mon, 28 Mar 2005, Chris Friesen wrote:
> Date: Mon, 28 Mar 2005 23:07:14 -0600
> From: Chris Friesen <[EMAIL PROTECTED]>
> To: krishna <[EMAIL PROTECTED]>
> Cc: Linux Kernel
> Subject: Re: How to measure time accurately.
>
> krishna wrote:
> > H
On Mon, 28 Mar 2005, Chris Friesen wrote:
Date: Mon, 28 Mar 2005 23:07:14 -0600
From: Chris Friesen [EMAIL PROTECTED]
To: krishna [EMAIL PROTECTED]
Cc: Linux Kernel linux-kernel@vger.kernel.org
Subject: Re: How to measure time accurately.
krishna wrote:
Hi All,
Can any one tell me
In some cases you can simply count jiffies - depending on how accurate you
need to time things I'd say that often something like this is adequate :
These some cases exclude this one:
If interrupts are disabled, a jiffy might be missed. Take care.
If you are on UP and want to measure within
- a
Chris == Chris Friesen [EMAIL PROTECTED] writes:
Chris krishna wrote:
Hi All,
Can any one tell me how to measure time accurately for a block of C
code in device drivers. For example, If I want to measure the time
duration of firmware download.
Chris Most cpus have some way of getting
Peter Chubb wrote:
Chris == Chris Friesen [EMAIL PROTECTED] writes:
Chris Most cpus have some way of getting at a counter or decrementer
Chris of various frequencies. Usually it requires low-level hardware
Chris knowledge and often it needs assembly code.
As a device driver is inside the linux
krishna wrote:
Hi All,
Can any one tell me how to measure time accurately for a block of C code
in device drivers.
For example, If I want to measure the time duration of firmware download.
Most cpus have some way of getting at a counter or decrementer of
various frequencies. Usually it requires
On Mon, 2005-03-28 at 08:58 +0530, krishna wrote:
> Hi All,
>
> Can any one tell me how to measure time accurately for a block of C code
> in device drivers.
> For example, If I want to measure the time duration of firmware download.
rdtsc()
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On Mon, 2005-03-28 at 08:58 +0530, krishna wrote:
Hi All,
Can any one tell me how to measure time accurately for a block of C code
in device drivers.
For example, If I want to measure the time duration of firmware download.
rdtsc()
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krishna wrote:
Hi All,
Can any one tell me how to measure time accurately for a block of C code
in device drivers.
For example, If I want to measure the time duration of firmware download.
Most cpus have some way of getting at a counter or decrementer of
various frequencies. Usually it requires
Hi All,
Can any one tell me how to measure time accurately for a block of C code
in device drivers.
For example, If I want to measure the time duration of firmware download.
Regards,
Krishna Chaitanya
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" i
Hi All,
Can any one tell me how to measure time accurately for a block of C code
in device drivers.
For example, If I want to measure the time duration of firmware download.
Regards,
Krishna Chaitanya
-
To unsubscribe from this list: send the line unsubscribe linux-kernel in
the body
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