[dm-devel] dm-userspace (no in-kernel cache version)

[FUJITA Tomonori]

From: Dan Smith <danms at us.ibm.com>
Subject: Re: [dm-devel] dm-userspace (no in-kernel cache version)
Date: Tue, 12 Sep 2006 14:50:02 -0700

> 2. I was unable to get your code to perform well with multiple threads
>    of dbench.  While my code sustains performance with 16 threads, the
>    non-cache/ringbuffer version slows to a crawl (~1MB/s with 16
>    procs).  I noticed that the request list grows to over a 100,000
>    entries at times, which means that the response from userspace
>    requires searching that linearly, which may be the issue.

Have you tried SCHED_FIFO?

By the way, can you upload or post the latest kernel and user-space
code?