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[ts-7000] Improving mdev and /dev population performance?

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Subject: [ts-7000] Improving mdev and /dev population performance?
From: "Blair" <>
Date: Fri, 02 Apr 2010 15:58:58 -0000
Are there ways to improve the performance of populating the /dev directory on 
startup?  On a 7350, I make use of some USB and audio drivers.  With the stock 
kernel and insmodding everthing I need, it take about 8 seconds from power on 
to a fully populated /dev directory.  Note that I get the shell prompt in about 
3 seconds.

I decided to try building a kernel with these module compiled in to improve 
start up times.  I had to turn off some components e.g. NFS in order to make an 
uncompressed kernel small enough to fit in the partition.  That aside, I only 
got about one second improvement in startup time.  I get a shell prompt in 3 
seconds but it takes another 4 seconds for /dev to be fully populated.

Clearly, mdev is the culprit.  So, are there ways to either prioritize device 
entry creation so that some /dev entries show up before others e.g. the audio 
and USB devices I care about or eliminate /dev entries I don't care about e.g. 
why are there a ton of tty devices?




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