Subject: Re: The SCSI DMA kernel.
To: Brian D Chase <bdc@world.std.com>
From: Anders Magnusson <ragge@ludd.luth.se>
List: port-vax
Date: 10/27/1999 10:43:31
> 
> It also depends a lot on the drive you're using and the blocksize you're
> using to access the drive.  For instance, if you're hitting the raw device
> /dev/rsd0c using `dd' with a block size of 64k vs 4k or 1k, you'll see
>
Note here that you probably get better performance with 60k than 64k.
This is because max transfer size is set to 63k on VAX. 64k will
force a request to be split into one big and one small, while a smaller
transfer (56k for example) will result only in big transfers.

-- Ragge