Messages in this thread | | | Subject | Re: Reiser4 status: benchmarked vs. V3 (and ext3) | From | Yury Umanets <> | Date | Sun, 27 Jul 2003 18:13:34 +0400 |
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On Sun, 2003-07-27 at 17:31, Hans Reiser wrote: > Yury Umanets wrote: > > >On Sat, 2003-07-26 at 18:13, Daniel Egger wrote: > > > > > >>Am Sam, 2003-07-26 um 09.19 schrieb Yury Umanets: > >> > >> > >> > >>>I think this is more then enough for running reiser4. Reiser4 is a linux > >>>filesystem first of all, and linux is able to be ran on even worse > >>>hardware then you have. > >>> > >>> > > > > > > > >>Linux is running just fine one the system, thanks. My question is > >>whether reiserfs is suitable for flash devices. The chances to get some > >>usable answers seem to be incredible low though... > >> > >> > > > >Reiserfs cannot be used efficiently with flash, as it uses block size 4K > >(by default) and usual flash block size is in range 64K - 256K. > >
> This answer is incorrect. The device driver will hide this from us, > slum squeezing will tend to write in large batches, and things will > probably work. However, you should try it and see rather than theorize.
See my explanation in last emails. Also I have not just theorized. I have been developing block device driver for MPIO players (Smart Card based one). And reiserfs does not use squeezing on flush (and I've spoken about reiserfs here).
> > > > >Also reiserfs does not use compression, that would be very nice of it > >:), because flash has limited number of erase cycles per block (in range > >100.000) and it is about three times as expensive as SDRAM. > >
> We have compression plugins that will be ready soon. Go ask Edward in > the chair behind you what he does for a living.;-)
Yes, we have compression plugins in reiser4, but we have spoken about reiserfs.
> > > > >So, it is better to use something more convenient. For instance jffs2. > > > >But, if you are still want to use reiserfs for flash device, you should > >do at least the following: > > > >(1) Make the journal substantial smaller of size. > >(2) Don't turn tails off. This is useful to prolong flash live. > > > > > >Regards. > > > > > > > He is asking about reiser4, not reiserfs V3. -- We're flying high, we're watching the world passes by...
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