Chunksize (was Re: Win32 SDL thread priorities)

Is there an official way to increase the thread priority
of the internal SDL audio/mixer thread under Win32 ?

Speaking of mixer & win32… I’m still confused by this whole "chunksize."

On my box (Celeron @ 450Mhz running Linux), audio sounds great.
On a friend’s box (Pentium @ 133Mhz running Windows95), audio is lagged.

I’m using a chunksize of 512. Should I decrease it? What does changing
the number actually do? What are the pros/cons of smaller numbers.
The pros/cons of larger numbers?