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Re: realtime preemption performance difference

Previous thread: 2.6.22.7 default kernel configuration by Jaswinder Singh on Monday, September 24, 2007 - 7:11 am. (3 messages)

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[view original message]
From: Jaswinder Singh <jaswinderlinux@...>
To: <linux-kernel@...>, <mingo@...>
Subject: realtime preemption performance difference
Date: Monday, September 24, 2007 - 7:48 am

Hi all,


I want to check performance difference by using realtime preemption patch :


http://www.kernel.org/pub/linux/kernel/projects/rt/


Please let me know from where I can download samples to test realtime

preemption performance difference.


Can someone please share performance numbers for your hardware:-


1. Interrupt latency

2. Task switching time

3. hard-realtime scheduling latency


Thank you,


Jaswinder Singh.

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[view original message]
From: Ankita Garg <ankita@...>
To: Jaswinder Singh <jaswinderlinux@...>
Cc: <linux-kernel@...>, <mingo@...>
Subject: Re: realtime preemption performance difference
Date: Wednesday, September 26, 2007 - 9:30 am

Hi Jaswinder,


You can obtain several -rt testcases from the RT wiki:

http://rt.wiki.kernel.org/index.php/Main_Page Here we have testcases/benchmarks

for measuring scheduling latencies, priority preemption, signaling latencies, etc

and other important information on the patchset.


--

Regards,

Ankita Garg (ankita@in.ibm.com)

Linux Technology Center

IBM India Systems & Technology Labs,

Bangalore, India

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[view original message]
From: hufey <hufeyy@...>
To: Jaswinder Singh <jaswinderlinux@...>
Cc: <linux-kernel@...>, <mingo@...>
Subject: Re: realtime preemption performance difference
Date: Monday, September 24, 2007 - 5:27 pm

As far as I know, some embedded linux vendors such as MontaVista

provide kernel patch to export some interfaces to measure realtime

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[view original message]
From: Jaswinder Singh <jaswinderlinux@...>
To: hufey <hufeyy@...>
Cc: <linux-kernel@...>, <mingo@...>, <dmitry.adamushko@...>, <a.p.zijlstra@...>, <randy.dunlap@...>, <efault@...>, <akpm@...>, <vatsa@...>, <dhaval@...>
Subject: Re: realtime preemption performance difference
Date: Wednesday, September 26, 2007 - 3:11 am

hello hufey,


I am not using montavista kernel, I am using standard linux kernel.


Realtime is known by worst case latencies. Ingo and team are claiming

for realtime support so their should be some samples and performance

numbers,


Can someone please share their samples and/or numbers.


Thank you,


Jaswinder Singh.


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[view original message]
From: Ankita Garg <ankita@...>
To: Jaswinder Singh <jaswinderlinux@...>
Cc: hufey <hufeyy@...>, <linux-kernel@...>, <mingo@...>, <dmitry.adamushko@...>, <a.p.zijlstra@...>, <randy.dunlap@...>, <efault@...>, <akpm@...>, <vatsa@...>, <dhaval@...>
Subject: Re: realtime preemption performance difference
Date: Wednesday, September 26, 2007 - 7:17 am

Hi Jaswinder,


You can obtain several -rt testcases from the RT wiki:

http://rt.wiki.kernel.org/index.php/Main_Page Here we have testcases/benchmarks

for measuring scheduling latencies, priority preemption, signaling latencies, etc

and other important information on the patchset.


--

Regards,

Ankita Garg (ankita@in.ibm.com)

Linux Technology Center

IBM India Systems & Technology Labs,

Bangalore, India

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Previous thread: 2.6.22.7 default kernel configuration by Jaswinder Singh on Monday, September 24, 2007 - 7:11 am. (3 messages)

Next thread: [patch 1/2] VFS: new fgetattr() file operation by Miklos Szeredi on Monday, September 24, 2007 - 8:24 am. (15 messages)