Re: general speed differences between 4.1.1-RELEASE and 4.3-RELEASE

[Erik Trulsson]

On Thu, May 24, 2001 at 10:18:13AM -0700, Ted Faber wrote:
> On Thu, May 24, 2001 at 12:48:02AM -0500, Mike Silbersack wrote:
> > Write caching is now off by default.  man ata to see how to turn it back
> > on.
> 
> Ummmm.  I setting hw.ata.wc=1 and got:
> 
> ted:~$ sudo sysctl -w hw.ata.wc=1
> sysctl: oid 'hw.ata.wc' is read only
> 
> I'm assuming that this is because my controller doesn't support write
> caching.  Can anyone confirm this?  If that's why the oid is
> read-only, a one-liner in the ata man page (that I'm happy to write)
> would be a good thing.

Nope, that error is beacuse it is only settable from within the
loader(8). You cannot set it with sysctl(8)
The relevant one-liner from the ata(4) man page is:

       The following tunables are setable from the loader:
...
       hw.ata.wc
...




-- 
<Insert your favourite quote here.>
Erik Trulsson
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