Messages in this thread | | | From | "Rafael J. Wysocki" <> | Subject | Re: uswsusp history lesson [was Re: [Suspend2-devel] Re: swsusp / suspend2 reliability] | Date | Wed, 12 Jul 2006 00:34:01 +0200 |
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On Wednesday 12 July 2006 00:01, Nigel Cunningham wrote: > On Wednesday 12 July 2006 07:54, Rafael J. Wysocki wrote: > > On Tuesday 11 July 2006 14:45, Nigel Cunningham wrote: > > > On Sunday 09 July 2006 04:52, Rafael J. Wysocki wrote: > > > > Well, I tried really hard to justify the patch that allowed swsusp to > > > > create bigger images and 10% was the greatest speedup I could get out > > > > of it and, let me repeat, _with_ compression and async I/O. I tried to > > > > simulate different workloads etc., but I couldn't get more than 10% > > > > speedup (the biggest image I got was as big as 80% of RAM) - counting > > > > the time from issuing the suspend command to getting back _responsive_ > > > > system after resume. > > > > > > Was that 10% speedup on suspend or resume, or both? With LZF, I see > > > approximately double the speed with both reading and writing: > > > > I was not referring to the speedup of writing and/or reading. > > > > The exercise was to measure the time needed to suspend the system and get > > it back in a responsive state. I measured the time elapsed between > > triggering the suspend and the moment at which I could switch between some > > applications in X without any noticeable lag due to faulting in some pages > > (that is a bit subjective, I must admit, but I was willing to show that > > bigger images make substantial difference). > > > > I tested uswsusp with compression (LZF) and two image sizes: 120 MB and > > (IIRC) about 220 MB on a 256 MB box. The result of the measurement for the > > 120 MB image has always been greater than for the 220 MB image, but the > > difference has never been greater than 10%. > > Ah ok. Are you sure you're getting that sort of throughput with LZF though - > if you're not, you might be underestimating the advantage.
Certainly I don't get that kind of speedup for writing. For reading I do.
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