linux-kernel - RT-Preemption is causing Very-High Interrupt Latency

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Sun, 17 Aug 2008 23:02:50 -0700 (PDT)
From:	p_ashish <priyadarshi.ashish@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: RT-Preemption is causing Very-High Interrupt Latency

I applied RT-preemption and High-Resolution Timer Patch to linux-2.6.19.2 . 
It gave satisfactory result for 'cyclic_test' and 
'HR-Timer clock-nanoSleep_test'. 

But the problem is that Interrupt Latency in much more than before. 
This is result which i got from my Interrupt Latency program.

WITH RT-preemption: 
(Max Latency= 513.1 micro seconds and Min Latency= 12.1 micro seconds)

WITHOUT RT-preemption:
(Max Latency= 13.1 micro seconds and Min Latency= 1.8 micro seconds)

Since, RT-preemption implements ISR like threads, so is this the reason for 
higher latency? Is there any way to improve this?

regards
~ashish

-- 
View this message in context: http://www.nabble.com/RT-Preemption-is-causing-Very-High-Interrupt-Latency-tp19026358p19026358.html
Sent from the linux-kernel mailing list archive at Nabble.com.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/