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Date: Wed, 10 Nov 2004 17:54:07 +0100
From: Sebastian Schulze Struchtrup <seb@struchtrup.com>
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To: Poul-Henning Kamp <phk@phk.freebsd.dk>
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cc: current@freebsd.org
Subject: Re: [HEADSUP]  Please help test device vnode bypass!
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Poul-Henning Kamp wrote:

>Please test this feature.
>
>Even better, help test the perforce branch phk_bufwork if you can.
>
>Poul-Henning
>
>In message <200411081046.iA8AklqT003808@repoman.freebsd.org>, Poul-Henning Kamp
> writes:
>  
>
>>phk         2004-11-08 10:46:47 UTC
>>
>> FreeBSD src repository
>>
>> Modified files:
>>   sys/fs/devfs         devfs_vnops.c 
>> Log:
>> Add optional device vnode bypass to DEVFS.
>>
>>    
>>

fops=0
1000000 bytes transferred in 4.865386 secs (205534 bytes/sec)

fops=1
1000000 bytes transferred in 2.513814 secs (397802 bytes/sec)

This would result in approx. 2us per syscall.

System is FreeBSD 6.0-CURRENT #25: Tue Nov  9 13:44:16 CET 2004  
(something like an Athlon XP 2k) with invariants and witness, without 
anything out of phk_bufwork.

No problems until now.