Re: [Nbd] performance

[folkert <folkert@...421...>]

> > I have the feeling somthing is not good in my setup as it seems the
> > performance looks as if it can be better.
> > The setup: quadcore (Q9450) @ 2,1GHz with 8GB ram.
> > On the server I run nbd-server and nbd-client via localhost.
> > The nbd-server has a sparse file of 10GB in a ramdisk (tmpfs).
> > Now when I create an ext2 filesystem (no journal overhead) and run
> > iozone I get the following values:
> >                                                    random  random    bkwd   record
> >      KB  reclen   write rewrite    read    reread    read   write    read  rewrite
> > 2097152     256  601977  699077   930964   932460  928055  706410 1011458   814914

(localhost)

> > Compare that with iozone directly in the ramdisk:
> >                                                    random  random    bkwd   record
> >      KB  reclen   write rewrite    read    reread    read   write    read  rewrite
> > 2097152     256 1497485 2211397  3293086  3318772 3231160 2267725 3268985 4805781
> > 
> > Quit a large difference isn't it?
> That comparison involves nbd-server running on localhost, I presume?

That's correct.

The system is idle apart from nbd-client/server.


Folkert van Heusden

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