atom feed294 messages in org.kernel.vger.linux-rt-usersMeasuring timer interrupt latency
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121 later messages
Subject:Measuring timer interrupt latency
From:Suresh Kumar SHUKLA (sure@st.com)
Date:Apr 12, 2009 11:44:19 pm
List:org.kernel.vger.linux-rt-users

Hi,

I want to profile the improvements in interrupt latency with and without RT patches.

The approach I have in mind is that time gap between IRQ firing and IRQ handler reading value of counter would be sufficient to reveal the interrupt latency. These values can be analysed for min/max/avg.

Is there any test program which captures interrupt latency (for x86) ? I checked realfeel but it is user mode program and am not sure of its accuracy.

regards, Suresh