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Re: [debian-knoppix] Performance issues on SMP vs UP (was Re: non-SMP kernel)



Hi,

I could build UP kernel, using;

# make-kpkg --added-patches xfs --config menuconfig \
  --revision myown kernel-image

Building initrd.gz with mkinitrd fails. So I tried to modify stock initrd
directly:

# cp initrd.gz initrd-UP.gz
# gunzip initrd-UP.gz

# loop -t auto initrd-UP /mnt/disk -o loop

# cp /lib/modules/2.4.20/kernel/fs/ext3/ext3.o /mnt/disk/modules
# cp /lib/modules/2.4.20/kernel/fs/jbd/jbd.o /mnt/disk/modules
# sync
# umount /mnt/disk
# gzip -9 initrd-UP

Do not forget to "sync" or lost changes made and initrd might be broken.

Modify lilo.conf and add new entries for the new kernel,boot...Okay!

Later I attach a bonnie++ result details...

According to the reports:

- Sequential Access: No significant speed up
- Random Access:     About 10-20% speed up !

Thanks for all advices!

Regards,
Max

[UP kernel]=================================================================
Version 1.02c       ------Sequential Output------ --Sequential Input- 
--Random-
                    -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- 
--Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec 
%CP
cyan-knoppix     1G 12323  94 34729  48 14337  17 12090  89 40164  14 129.4   
0
                    ------Sequential Create------ --------Random 
Create--------
                    -Create-- --Read--- -Delete-- -Create-- --Read--- 
-Delete--
              files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec 
%CP
                 16   634  97 +++++ +++ +++++ +++   642  98 +++++ +++  2378  
96

[MP kernel - NO SMP feature]===============================================
Version 1.02c       ------Sequential Output------ --Sequential Input- 
--Random-
                    -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- 
--Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec 
%CP
cyan-knoppix     1G 11774  95 34082  56 14017  17 12213  76 39305  16 124.7   
0
                    ------Sequential Create------ --------Random 
Create--------
                    -Create-- --Read--- -Delete-- -Create-- --Read--- 
-Delete--
              files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec 
%CP
                 16   509  98 +++++ +++ 32583 101   534  97 +++++ +++  2051  
97
[MP kernel - SMP feature]==================================================
Version 1.02c       ------Sequential Output------ --Sequential Input- 
--Random-
                    -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- 
--Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec 
%CP
cyan-knoppix     1G 11727  74 34294  49 14078  17 12527  94 40749  17 131.5   
0
                    ------Sequential Create------ --------Random 
Create--------
                    -Create-- --Read--- -Delete-- -Create-- --Read--- 
-Delete--
              files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec 
%CP
                 16   493  98 +++++ +++ 32222 100   509  98 +++++ +++  2048  
97
===========================================================================



-- 
Masaharu "Max" Goto
GnuPG Key fingerprint = 4D69 6B1D 484D 999C EDA7  2853 32AF 0C86 9323 3DDB

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