Re: reiser fs slow on mksf and mount

["Vladimir V. Saveliev" <vs@namesys.com>]

Hello

Ming Zhang wrote:
> forget to mention that original mount is immediately after mkfs. so no
> files in fs at all.
> 
> now i create 1048576 4KB files
> 
> then umount and remount
> 
> [root@bakstor2u root]# time mount /dev/md0 t
> 
> real    1m10.971s
> user    0m0.001s
> sys     0m0.188s
> 
> almost same as first one.
> 
> this is from dmesg
> 
> ReiserFS: md0: found reiserfs format "3.6" with standard journal
> ReiserFS: md0: using ordered data mode
> ReiserFS: md0: journal params: device md0, size 8192, journal first
> block 18, max trans len 1024, max batch 900, max commit age 30, max
> trans age 30
> ReiserFS: md0: checking transaction log (md0)
> ReiserFS: md0: Using r5 hash to sort names
> 
> 
> so i could not understand why mount a fs with 0 files is same time with
> mount a fs with 1M files.
> 
> Thanks!
> 
> Ming
> 
> 
> 
> On Fri, 2005-08-26 at 13:08 -0400, Ming Zhang wrote:
>>i think 3.2TB partition is not that big these days right?
>>
>>i would think some people that hold millions of files will have much
>>larger partition than this.
>>
>>so you think this is a normal speed for such size partition?
>>

No. That was joke actually.
Speed of mkfs.reiserfs confuses me.
As you did answer about whether all disks were spinning - I suppose that they were.
Can you please run vmstat 1  or iostat 1 while mkreiserfs is running?

>>also iostat 1 -k shows that during mount, there are small size read
>>happen each second. so this is because read meta data and metadata is
>>not continuous on disk?
>>

Yes. On mount reiserfs reads all bitmap blocks to memory. Those blocks are spread over whole disk. There is workaround for this problem.

>>>>
>>>There is a patch to cure this problem.
>>>http://www.mail-archive.com/reiserfs-list@namesys.com/msg18442.html
>>>Please note that it is experimental one.
>>>
>>>>
>>>>
> 
> 
>