Message-ID: <3F23D43C.9080607@namesys.com>
Date: Sun, 27 Jul 2003 17:31:40 +0400
From: Hans Reiser <reiser@namesys.com>
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To: Yury Umanets <umka@namesys.com>
Cc: Daniel Egger <degger@fhm.edu>, Nikita Danilov <Nikita@Namesys.COM>,
       Linux Kernel Mailinglist <linux-kernel@vger.kernel.org>,
       reiserfs mailing list <reiserfs-list@namesys.com>
Subject: Re: Reiser4 status: benchmarked vs. V3 (and ext3)
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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.

>
>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.;-)

>
>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.

-- 
Hans


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