Re: reiser4 mount options

[butdiene <butdiene@yahoo.com>]

I think this is a success report.

with optimal_io_size=2097152,atom_max_size=0x800, reiser4 runs very
reasonable now. I put very heavy load on the file system. In past, those
operations would definitely hang firefox for minutes, but it's barely
noticeable now.

fstab line:
UUID=1b9fdd32-127f-4751-b6aa-5eb300000000 /		reiser4
defaults,iocharset=utf8,optimal_io_size=2097152,atom_max_size=0x800	0 1

cat /proc/mounts:
/dev/root / reiser4
rw,atom_max_size=0x2f238,atom_max_age=0x927c0,atom_min_size=0x100,atom_max_flushers=0x1,cbk_cache_slots=0x10
0 0

/proc/mounts doesn't agree with either fstab or "mount", I don't know why. I
dare not to modify reiser4 source to print out valid settings.

thanks a lot!


output of mount:
/dev/sda3 on / type reiser4
(rw,iocharset=utf8,optimal_io_size=2097152,atom_max_size=0x800)




Edward Shishkin wrote:
> 
> butdiene wrote:
> 
>>right now, I'm using the following setting. mount options are not the same
as
>>in /proc/mounts, I'm not sure which ones are accepted.
>>
>>but the system seems to be more responsible now. the  optimal_io_size was
>>64KB, seems to be too small.
>>
>>I reduced the atom_max_size (from 0x2f238 = 784MB) to 0x800= 8MB.
>>
>>not sure how they would help. I will report later if it really helps.
>>
>>thanks
>>
>>mount|grep sda3;cat  /proc/mounts |grep root
>>/dev/sda3 on / type reiser4
>>(rw,iocharset=utf8,tmgr.atom_max_flushers=0,optimal_io_size=2097152,atom_max_size=0x800,atom_max_age=0x600,atom_max_flushers=0)
>>rootfs / rootfs rw 0 0
>>/dev/root / reiser4
>>  
>>
> atom_max_size=0x2f238,atom_max_age=0x927c0,atom_min_size=0x100,atom_max_flushers=0x1,cbk_cache_slots=0x10
> 
> ^^^^^^^^^^^^^^^^^^^^   
> 
> You have atom_max_size unchanged.
> Please, edit your /etc/fstab and reboot.
> 
> Thanks,
> Edward.
> 
>>0 0
>>
>>
>>Edward Shishkin wrote:
>>  
>>
>>>butdiene wrote:
>>>
>>>    
>>>
>>>>Hi,
>>>>
>>>>I run reiser4 on a laptop. I got serious fsync/flush problem.
>>>>
>>>>almost randomly, the hard drive would run busy for minutes to dozens of
>>>>minutes. while the computer is still responsive during this period, but
>>>>firefox would hang until the hard gets idle again.
>>>> 
>>>>
>>>>      
>>>>
>>>Hm.. firefox is fsync-bound app?
>>>
>>>    
>>>
>>>>I guess I can set mount options to improve the situation.
>>>> 
>>>>
>>>>      
>>>>
>>>That hang can have a complex nature.
>>>
>>>Well, try to play with the mount option "tmgr.atom_max_size=N",
>>>where N is atom size in blocks (by default it is total RAM pages / 4).
>>>Look at /proc/mounts to make sure that your changes take effect.
>>>
>>>If it doesn't help, then let me know.
>>>
>>>Thanks,
>>>Edward.
>>>
>>>    
>>>
>>>>Any suggestion is appreciated.
>>>>
>>>>thanks
>>>> 
>>>>
>>>>      
>>>>
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>>>
>>>    
>>>
>>
>>  
>>
> 
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