FW: RAW on Linux

Michael E Brown michael_e_brown at dell.com
Thu Mar 14 13:23:00 CST 2002


A better place to ask would be redhat-list at redhat.com.
--
Michael Brown
Linux Solutions
Dell Computer

On Thu, 14 Mar 2002, Thanh Ma wrote:

> Anyone knows if/when this patch will be included in an errata ?
> 
> Thanks,
> Thanh
> 
> -----Original Message-----
> From: Sergey E. Volkov [mailto:sve at raiden.bancorp.ru]
> Sent: Thursday, March 14, 2002 12:22 PM
> To: Peter J Diaz de Leon
> Cc: linux-informix at iiug.org
> Subject: Re: RAW on Linux
> 
> 
> I don't know about main tree, but it's definitely has been included into
> 'aa' tree.
> 
> Take a look at 'linux/drivers/char/raw.c'
> 
> typedef struct raw_device_data_s {
>         struct block_device *binding;
>         int inuse, sector_size, sector_bits;
>         struct semaphore mutex;
>         int can_do_vary;
> } raw_device_data_t;
> 
> My kernel is 2.4.19-pre3aa2 and that's here ( int can_do_vary ).
> I think it will be included into the next kernel from SuSE ( 2.4.17-SuSE ).
> 
> Now 2.4.19-X  is development series and you shouldn't use it for production
> system.
> 
> 
> ----- Original Message -----
> From: "Peter J Diaz de Leon" <pdiazdeleon at infinityhealthcare.com>
> Cc: <linux-informix at iiug.org>
> Sent: Thursday, March 14, 2002 5:47 PM
> Subject: Re: RAW on Linux
> 
> 
> > Does anyone know if this patch has made it into the kernel source tree
> yet?
> > I scaned the changelogs and did not see it mentioned.
> >
> > Thanks
> > Peter
> >
> >
> > >
> > > List:     linux-kernel
> > > Subject:  [PATCH] PAGE_SIZE IO for RAW (RAW VARY)
> > > From:     Badari Pulavarty <pbadari at us.ibm.com>
> > > Date:     2002-01-09 17:41:10
> > >
> > > Hi,
> > >
> > > Here is a 2.4.17 patch for doing PAGE_SIZE IO on raw devices. Instead
> > > of doing 512 byte buffer heads, the patch does 4K buffer heads. This
> > > patch significantly reduced CPU overhead and increased IO throughput
> > > in our database benchmark runs. (CPU went from 45% busy to 6% busy).
> > >
> > > Could you please consider this for 2.4.18 release ? If you need the
> > > patch on 2.4.18-preX, I can make one quickly.
> > >
> > > [ snip ]
> > >
> > > Thanks,
> > > Badari
> > >
> >
> 
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-- 
Michael E. Brown, RHCE, MCSE+I, CNA
Dell Linux Solutions
http://www.dell.com/linux

  If each of us have one object, and we exchange them,
     then each of us still has one object.
  If each of us have one idea,   and we exchange them,
     then each of us now has two ideas.





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