Raphael Pooser wrote:
As people here have said, your system is pretty much right on for an
HDTV set up that could say, transcode at the same time as watching live
TV for instance. For just watching straight live TV or HDTV recordings,
as someone else said any fairly recent athlon64 variant (like a 3200+ as
you were thinking) would do. As to the question about more RAM, true
that in linux the ram you give it the more it can use and the more stuff
you can have open, unlike in windows with most of its applications.
However, if I was going to choose between one more gig of ram or going
from one to dual core, dual core would definitely win out. Mainly the
only performance increase you are gonna get is in the RAID (from the
benchmarks quoted in above post), but since you don't need anything
anywhere nearly close to that level of performance as you already knew,
the extra 1GB or RAM is pretty much wasting money. I don't know how I
could possibly get mythtv to actually fill up a gig of RAM at any rate.
Maybe a backend connected to 5 or so frontends?
Raphael
Thanks. Your response (and others) matches what I'd expected to hear:
dual core if I want to do something else CPU-intensive (like transcode)
as well as run myth. I still don't see -- as you obviously don't -- how
an extra GB of RAM will improve things much. I'd have to be doing
something else on the system that did heavy I/O or otherwise could use a
lot of RAM. Capture of data from an HD card gets data at a very flat
rate: either you keep up or you don't. Basic queueing theory shows
that if the arrival rate is near constant you won't get a big queue (for
disk output). Consequently, beyond the minimum amount of buffering
needed to keep up and a bit of headroom for safety, a huge buffer cache
will just hold things that aren't going to be read back any time soon
any way. The benchmark referred to was for a different kind of load on
the RAID system.
Cheers,
Len
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