On Tue, 2013-01-29 at 17:51 +0100, Andrea Arcangeli wrote: > Hi everyone, > > On Tue, Jan 29, 2013 at 04:26:13AM +0200, Izik Eidus wrote: > > On 01/29/2013 02:49 AM, Izik Eidus wrote: > > > On 01/29/2013 01:54 AM, Andrew Morton wrote: > > >> On Fri, 25 Jan 2013 17:53:10 -0800 (PST) > > >> Hugh Dickins <hughd@xxxxxxxxxx> wrote: > > >> > > >>> Here's a KSM series > > >> Sanity check: do you have a feeling for how useful KSM is? > > >> Performance/space improvements for typical (or atypical) workloads? > > >> Are people using it? Successfully? > > > > > > BTW, After thinking a bit about the word people, I wanted to see if > > normal users of linux > > that just download and install Linux (without using special > > virtualization product) are able to use it. > > So I google little bit for it, and found some nice results from users: > > http://serverascode.com/2012/11/11/ksm-kvm.html > > > > But I do agree that it provide justifying value only for virtualization > > users... > > Mostly for virtualization users indeed, but I'm aware of a few non > virtualization users too: > > 1) CERN has been one of the early adopters of KSM and initially they > were using KSM standalone (probably because not all hypervisors they > had to deal with were KVM/linux based, while all guests were linux and > in turn KSM capable). More info in the KSM paper page 2: > > http://www.kernel.org/doc/ols/2009/ols2009-pages-19-28.pdf > > However lately they're running KSM in combination with KVM too, and I'm > not sure if they're still using it standalone. See the "KSM shared" > blue area in slide 12 and the comparison with KSM on and off in slide > 14. > > https://indico.fnal.gov/getFile.py/access?contribId=18&sessionId=4&resId=0&materialId=slides&confId=4986 > > 2) all recent cyanogenmod in the performance menu in settings supports > KSM out of the box. You can run it for a while and then shut it > off. > > Not sure how good idea it is to leave it always on, but the only > efficient cellphone/tablet powersaving design (i.e. the wakelocks + > suspend to ram) still won't waste energy while the screen is off and > the phone has suspended to ram, regardless of KSM on or off. > > KSM NUMA awareness however is not needed on the cellphone :). Thanks for your sharing. Is there ksm benchmark? How to get it? > > -- > To unsubscribe, send a message with 'unsubscribe linux-mm' in > the body to majordomo@xxxxxxxxx. For more info on Linux MM, > see: http://www.linux-mm.org/ . > Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a> -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>