Mailinglist Archive: packet-writing (44 mails)

[Jens Axboe <axboe@xxxxxxx>]

On Sun, May 05 2002, Peter Osterlund wrote:
> On Wed, 13 Mar 2002, Jens Axboe wrote:
> 
> > On Wed, Mar 13 2002, Manfred Kreisl wrote:
> > > Hi,
> > > 
> > > I can make packet-writing work.
> > 
> > I suppose that should rean "can't" :-)
> > 
> > The problem is that you have the your CD-RW on the 1542 adapter. That
> > only supports 16 segments in a request, packet writing typically needs
> > 32.
> 
> This is now supported in the 2.5 version of the packet patch:
> 
> http://w1.894.telia.com/~u89404340/patches/packet/2.5/packet-2.5.13.patch.bz2
> 
> There is a new config option which when enabled makes sure to use 4kb
> segments, which means that 16 segments is enough for a 64kb packet.

I disagree with making this an explicit option, it would be far better
to find the host the particular device is on and check for scatter
gather limits. It's all right there in the request queue (hint:
nr_phys_segments)

-- 
Jens Axboe