Messages in this thread | | | Date | Sat, 24 Jun 2006 08:03:03 -0400 | From | "André Goddard Rosa" <> | Subject | Re: [ck] Re: [PATCH] fcache: a remapping boot cache |
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On 6/24/06, Jens Axboe <axboe@suse.de> wrote: > On Sat, Jun 24 2006, James wrote: > > Set this up on my laptop yesterday with some awesome results. I'm > > using 2.6.17-ck1 which has v2.1. > > > > Heres some bootcharts, before, after, and a prime run. > > > > http://archlinux.org/~james/normal.png > > http://archlinux.org/~james/fs-fcache.png > > http://archlinux.org/~james/fs-fcache-prime.png > > > > Repeated boots show about the same 6 second improvement, 32 down to 26 > > seconds. Looking at the slowdowns in the fs-fcache run, most are due > > to cpu load, waiting on network or, modprobe, and not disk access. X > > now starts nearly instantaneously. > > > > As an experiment, I primed my cache right through to logging into my > > desktop environment. It was so effective, that now when I login, the > > GNOME splash screen only flickers onto the screen briefly, and the > > panels appear almost instantly. This is a big improvment over without > > fcache, where you'd see each component of GNOME being loaded on the > > splash screen, nautilus, metacity, and the panels would take quite a > > bit of time to render and load all their applets. > > > > Impressive work, I hope to see it broadened to other filesystems, > > improved and merged to vanilla soon because it has clear improvements. > > Thanks for giving it a spin! I have plans to implement some improvements > on monday that will speed it up even more, I hope I can talk you into > retesting it then. Basically it make sure we always get full speed out > of the drive by extending the 4kb reads with a sliding window cache. > That will help both drive efficiency, and also speed up the cases where > sub sequent boots differ just a little bit from the primed boot (often > the case with parallel init scripts). It should win you a few seconds > more in total, would be my guess. > > I hope to be able to extend it to xfs and reiser in the very near future > as well, should not be hard to do.
Impressive good work, Jens!
Do you have any distribution in contact with you already?
Thank you so much, I look forward to test it on xfs.
Best regards, -- []s, André Goddard - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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