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.\" Hey Emacs! This file is -*- nroff -*- source.
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.\"
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.\" This manpage is Copyright (C) 2003 Matthew Wilcox
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.\"
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel is constantly changing, this manual page may
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.\" be incorrect or out-of-date. The author(s) assume no responsibility
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.\" for errors or omissions, or for damages resulting from the use of the
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.\" information contained herein.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\"
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.\" FIXME Probably we should drop this page, as it is
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.\" the only one that we have in Section 9, and it
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.\" is not being mainatained.
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.\"
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.TH KSOFTIRQD 9 2003-08-24 "Linux 2.6.0" "Linux Programmer's Manual"
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.SH NAME
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ksoftirqd \- Softirq daemon
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.SH DESCRIPTION
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.B ksoftirqd
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is a per-cpu kernel thread that runs when the machine is under heavy
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soft-interrupt load.
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Soft interrupts are normally serviced on return from
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a hard interrupt, but it's possible for soft interrupts to be triggered
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more quickly than they can be serviced.
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If a soft interrupt is triggered
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for a second time while soft interrupts are being handled, the
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.B ksoftirq
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daemon is triggered to handle the soft interrupts in process context.
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If
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.B ksoftirqd
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is taking more than a tiny percentage of CPU time, this indicates the
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machine is under heavy soft interrupt load.
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.SH HISTORY
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.B ksoftirqd
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was introduced during the 2.3 development series as part of the
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softnet work by Alexey Kuznetsov and David Miller.
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