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Re: User mode drivers: part 1, interrupt handling (patch for 2.6.11)

From:  Michael Raymond <>
To:  Peter Chubb <>
Subject:  Re: User mode drivers: part 1, interrupt handling (patch for 2.6.11)
Date:  Fri, 11 Mar 2005 07:50:32 -0600
Archive-link:  Article, Thread

    I have many users asking for something like this.  Peter's approach is
simple and it appears to solve the problem for many situations.
    With that in mind though, for a more complicated but higher performing
approach please take a look at the User Level Interrupt (ULI) project at  It requires some per-arch assembly but
with some recent changes we're seeing ~1.5us latency from hardware event to
user space function start.  I'm hoping to add an IA32 port out soon.

On Fri, Mar 11, 2005 at 02:36:10PM +1100, Peter Chubb wrote:
> As many of you will be aware, we've been working on infrastructure for
> user-mode PCI and other drivers.  The first step is to be able to
> handle interrupts from user space. Subsequent patches add
> infrastructure for setting up DMA for PCI devices.

Michael A. Raymond              Office: (651) 683-3434
Core OS Group                   Real-Time System Software

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