Re: reiser4.1

[Edward Shishkin]

Pysiak Satriani wrote:
Hi
 

Compression is what will be in 4.1, not the repacker.  At least, I hope
edward gets it done soon.....
   

I've read an interview with Hans in the polish edition of Chip Special some
time ago.
I remember Hans saying that nowadays CPUs are so fast, they compress
faster than HDDs move the heads around and do the writes.
That is the fact. Moreover CPUs tends to develop faster then hard drives.
So compression,
if done properly, can be with no negative impact to speed.
Can you say what level of compression with which processors would handle
it without speedloss?
We don't have comprehensive benchmarks as it is not quite stable. The 
following is some
results for 'cp'. Note that the cpu time doesn't include flushing and 
compression:

belka workstation:
Dual Intel(R) Xeon(TM) CPU 2.40GHz;
1G RAM;
36G ide   partition;
SMP on;
Linux 2.6.9-rc1-mm5
reiser4 (Large keys)
Creation of 20 linux source trees
UNIX_FILES:
(policy=tails)
real    2m32.505s
sys     1m18.876s
df      3205900
(policy=smart)
real    2m22.251s
sys     1m1.100s
df      3292936
CRYPTCOMPRESS FILES
(64K compression):
NONE
real    2m27.448s
sys     0m46.702s
df      3214952
GZIP1
real    2m50.132s
sys     0m44.647s
df      1045660
LZO1
real    1m52.028s
sys     0m44.779s
df      1343188
LZRW1
real    1m50.048s
sys     0m44.644s
df      1504196

Regards,
Maciej