[Linux-cluster] Re: [PATCH 00/14] GFS

[David Teigland <teigland redhat com>]

On Tue, Aug 02, 2005 at 09:45:24AM +0200, Arjan van de Ven wrote:

> * +	if (create)
> +		down_write(&ip->i_rw_mutex);
> +	else
> +		down_read(&ip->i_rw_mutex);
> 
> why do you use a rwsem and not a regular semaphore? You are aware that
> rwsems are far more expensive than regular ones right?  How skewed is
> the read/write ratio?

Rough tests show around 4/1, that high or low?