Subject: Re: maximum size of 8KB in copyin\out
To: Maen Suleiman <>
From: Matt Thomas <>
List: port-arm
Date: 03/09/2007 15:57:59
Maen Suleiman wrote:
> Hi,
>  We are implmenting copyin\out using DMA engine, and we have noticed
> that the maximum buffer size is 8KB (for example when using 'dd
> if=/dev/sd0c of=/dev/null bs=131072' ) , Is there a reason for this?
> can this size be increased ?

Why are you the buffered device instead of the raw device?  Try the
raw device (/dev/rsd0c) and you'll vastly different behavior.