Re: [PATCH 2/8] readahead: make default readahead size a kernelparameter

[Jan Kara]

On Wed 30-11-11 21:29:28, Wu Fengguang wrote:
> > cat /etc/udev/rules.d/60-readahead.rules
> > # 
> >  
> >  
> > 
> > # Rules to set an increased default max readahead size for s390 disk 
> > devices 
> >  
> > 
> > # This file should be installed in /etc/udev/rules.d 
> >  
> >  
> > 
> > # 
> >  
> > SUBSYSTEM!="block", GOTO="ra_end" 
> > 
> > ACTION!="add", GOTO="ra_end" 
> > 
> > # on device add set initial readahead to 512 (instead of in kernel 128) 
> > 
> > KERNEL=="sd*[!0-9]", ATTR{queue/read_ahead_kb}="512" 
> > 
> > KERNEL=="dasd*[!0-9]", ATTR{queue/read_ahead_kb}="512" 
> 
> So SLES (@s390 and maybe more) is already shipping with 512kb
> readahead size? Good to know this!
  SLES (and openSUSE) since about 2.6.16 times is shipping with 512kb
readahead on everything... With some types of storage it makes a
significant difference.

								Honza
-- 
Jan Kara <jack@xxxxxxx>
SUSE Labs, CR
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