Re: How to make Linux scale up WRT bandwidth and size?

Alan Cox (alan@lxorguk.ukuu.org.uk)
Thu, 29 Apr 1999 23:27:34 +0100 (BST)


> Or memory map the frame grabber and write to the file - thats how the
> existing video4linux rtjpeg tools work
>
> Well, if the frame grabber driver does not mind mapping 20GB in one
> piece... I have to test both and see what I will do.

They don't need to - the capture is running in a ring buffer. You'd probably
want more than the default two frames for this but thats just a case of having
lots of ram. You don't need to map 20gigs.

> Not on a 64bit machine like the Alpha
>
> Well, if it does not, it is 2.2.x news. On our stock RedHat 5.2

it is 2.2 news

> change made. I would guess that >2GB files on the Alpha are possible
> on NFS and some foreign file systems.

NFSv2 is defined as a 32bit fs. ext2fs on 2.2 Alphas is 64bit all the way
NFSv3 is the first NFS that supports 64bit.

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