linux-kernel - threaded interrupt handler

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Message-ID: <q2pcfeab66d1004270927we59dd900hc6fb90cb7c1ecf6b@mail.gmail.com>
Date:	Tue, 27 Apr 2010 21:57:36 +0530
From:	ratheesh k <ratheesh.ksz@...il.com>
To:	linux-kernel@...r.kernel.org, netfilter@...r.kernel.org
Subject: threaded interrupt handler

Top half of  interrupt is implemented as kernel thread  in my embedded
linux  , this act as a Home  Router . It has a wan -interface (eth1 )
and lan-interface t( eth0 )

https://rt.wiki.kernel.org/index.php/RT_PREEMPT_HOWTO
http://lwn.net/Articles/302043/


1. if i flood packets on my wan network interface , i can see cpu
utilization of  ksoftirq-rx ( kernel thread ) goes high . But  irq-rx
( kernel thread ) cpu utilization remains same . Why is it so ?


2 . I  modified static priority of  ksoftirq-rx  ( using renice )  to
+19 and  my user space application ( say app-x ) is made -19 . But
still my app-x wont get any cycles ??


3 . How do i set scheduling algorithm of all processes and threads to
Round Robin . So that my app-x would get some processor cycles ?
    Should i individually set  scheduling algorithm for each process ?


thanks,
ratheesh
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