[Nbd] performance

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

Hi,

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
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?


Folkert van Heusden

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