[linux-dvb] Re: DVB cards in a Server, Buffer sizes

[Christophe Massiot <cmassiot@freebox.fr>]

On Sat, Sep 04, 2004, Holger Waechtler wrote:

> >As you can see the s/t/c-zap family of programs sets a buffer size of 
> >64kByte on the demux device. This is not very much. Even a workstation can 
> >be (disk-io) busy for a few seconds - not to mention a server. I do not 
> >want to discuss the problem of missing (disk-)io priorities in the kernel, 
> >but my question simply is:
> >
> >   IS IT RECOMMENDED AND SAFE TO USE A LARGER BUFFER?
> >
> >I would feel better to tell the driver to grab 512 kByte of precious 
> >kernel memory. What do you think?
> >
> 
> you can do so if you want, that's the intention of this ioctl(). But is 
> it really needed? Our experiences showed that these values are usually 
> ok for normal environments.

What can be the cause of the EOVERFLOW error then ? I'm experiencing it
at least once a day on my machines, too. Is it in any way related to
a buffer size ?

-- 
Christophe Massiot                  Freebox S.A.