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Date: Thu, 26 Apr 2007 19:29:55 +0200 From: Luca Tettamanti <kronos.it@...il.com> To: Nigel Cunningham <nigel@...el.suspend2.net> Cc: Pekka Enberg <penberg@...helsinki.fi>, Linus Torvalds <torvalds@...ux-foundation.org>, linux-kernel@...r.kernel.org Subject: Re: Back to the future. Nigel Cunningham <nigel@...el.suspend2.net> ha scritto: > On Thu, 2007-04-26 at 11:17 +0300, Pekka Enberg wrote: >> On 4/26/07, Nigel Cunningham <nigel@...el.suspend2.net> wrote: >> > * Mulithreaded I/O (might as well use multiple cores to compress the >> > image, now that we're hotplugging later). >> >> I assume this doesn't affect the kernel at all with uswsusp? > > Well uswsusp would benefit from using multiple threads - if it can - to > do the work. I saw quite an improvement from implementing it. It's doable[1], but I'm not sure that the added complexity is worth of it. I'm suprised that you see a big improvement. I'd expect that the image write is bottlenecked by the disk performance. On my PC (Core2, locked at 1.6GHz) lzf can compress 250-280MB/s; even with an older CPU that can do 1/3 it's still more than the disk can handle. Luca [1] We may even use MPI to compress over a Beowulf cluster, it's userspace ;) -- "Ricorda sempre che sei unico, esattamente come tutti gli altri". - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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