On Wednesday 23 May 2007 06:42, Ash Milsted wrote: > Hi. I just did some video encoding on my desktop and I was noticing > (for the first time in a while) that running apps had to hit swap quite > a lot when I switched to them (the encoding was going at full blast for > most of the day, and most of the time other running apps were > idle). Now, a good half of my RAM appeared to be free during all this, > so I was thinking at the time that it would be nice if swap prefetch > could be tunably more aggressive. I guess it would be ideal in this > case if it could kick in during tunably low disk-IO periods, even if > the CPU is rather busy. I'm sure you've considered this, so I only butt > in here to cast a vote for it. :)
In this case nicing the video encode should be enough to make it prefetch even during heavy cpu usage. It detects the total nice level rather than the cpu usage. > Of course, I could be completely wrong about the possibility.. and I > seem to remember that the disk cache can take up about half the ram by > default without this showing up in 'gnome-system-monitor'... which I > guess might happen during heavy encoding.. but even if it did, I could > have set the limit lower, and would then have still appreciated > prefetching. I plan to make it prefetch more aggressively by default soon and make it more tunable too. -- -ck - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
