Messages in this thread |  | | From | "Bradley D. LaRonde" <> | Subject | Re: Mounting a in-ROM filesystem efficiently | Date | Thu, 13 Dec 2001 15:09:16 -0500 |
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----- Original Message ----- From: "Richard B. Johnson" <root@chaos.analogic.com> To: "Bradley D. LaRonde" <brad@ltc.com> Cc: "Thomas Capricelli" <orzel@kde.org>; <linux-kernel@vger.kernel.org> Sent: Thursday, December 13, 2001 2:41 PM Subject: Re: Mounting a in-ROM filesystem efficiently
> On Thu, 13 Dec 2001, Bradley D. LaRonde wrote: > > > ----- Original Message ----- > > From: "Richard B. Johnson" <root@chaos.analogic.com> > > To: "Bradley D. LaRonde" <brad@ltc.com> > > Cc: "Thomas Capricelli" <orzel@kde.org>; <linux-kernel@vger.kernel.org> > > Sent: Thursday, December 13, 2001 1:34 PM > > Subject: Re: Mounting a in-ROM filesystem efficiently > > > Well RAM is a hell of a lot cheaper than NVRAM. If you don't have > > > the required RAM on your box, the hardware engineers screwed up > > > and have to be "educated" preferably with an axe in the parking-lot. > > > > As I mentioned before, there may be other-than-cost considerations for > > choosing the amount of RAM on a box. For example, low power consumption on > > portable devices. For another example, a huge ROM database that doesn't > > need to be in RAM all at once. > > > > Regards, > > Brad > > > > Then you make a block-device device-driver that extracts and uncompresses > each read from ROM/NVRAM upon demand. It pretends to write. The actual > data-storage device is still paged and it only writes to the caller's > buffer so it doesn't use any RAM for storage.
Or you could use cramfs + the patch that I mentioned a few e-mails ago. :-)
> There are many arguments, but I don't think power consumption is > one of them. Whatever they use for RAM on the palm machines allows > the machines to run a week on 4 'aa' -size batteries. Maybe they > grab kinetic energy from keystrokes using flea-generators ^;).
No flea-generators that I know of. :-)
SDRAM, even in self-refresh mode, does draw considerable current. But then again so does decompressing stuff from ROM all the time.
Regards, Brad
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