Re: Anyone putzing with NBD besides me?

Pavel Machek (pavel@atrey.karlin.mff.cuni.cz)
Wed, 29 Sep 1999 12:56:46 +0200


Hi!

> Good morning to everyone on the list.
>
> Is anyone working with the Network Block Device driver (NBD) in
> 2.2.12. If so what type of luck are you having.
>
> I grabbed the tarball of userland stuff from Pavel's site and have it
> up and running between a couple of SMP dual PII-450 systems. I can
> make a filesystem on the device and mount it and read/write files just
> fine.
>
> Problems seem to occur when the device gets subjected to large amounts
> of I/O. In these cases the throughput goes way, way done. The
> slowdown can be pretty easily demonstrated by running Bonnie with a
> scratch filesize of 200-300 megabytes.

Userland client has by-design poor performance. It does not do i/o
request reordering :-(.
Pavel

-- 
The best software in life is free (not shareware)!		Pavel
GCM d? s-: !g p?:+ au- a--@ w+ v- C++@ UL+++ L++ N++ E++ W--- M- Y- R+

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