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Re: [Nbd] NBD Super Size io operations



I've applied the patch but I don't think I see any gain?

now (= with that patch) with block size 1024KB:
                                                            random  random    bkwd   record   stride
              KB  reclen   write rewrite    read    reread    read   write    read  rewrite     read   fwrite frewrite   fread  freread
         2097152    1024   35080   35989   135806   132713  134109   35615  133128    35345   139671    57022    58270  125159   131571

now (= with that patch) with block size 128KB:
                                                            random  random    bkwd   record   stride
              KB  reclen   write rewrite    read    reread    read   write    read  rewrite     read   fwrite frewrite   fread  freread
         2097152     128   36651   35484   112819   113962  114233   34810  113014    35782   119221    55876    54225  115214   117897

previously version (stock 3.8 with signal patch):
                                                            random  random    bkwd   record   stride
              KB  reclen   write rewrite    read    reread    read   write    read  rewrite     read   fwrite frewrite   fread  freread
         2097152     128   37035   38578   168336   142210  138569   36966  110692    31541   143964    53846    53114  122773   124531


Tested using nbd-server on ramdisk, client in a vm (kernel 3.8, see above), tested with iozone3 from debian testing:
	iozone -j 1024 -s 2g -r 128k -I -f test -+w 7

Test system is a Linux system with kernel 2.6.38 and vmware workstation 9.
It has a Q9450 running at 2.1GHz and 8GB of ram with 512MB of ram for the vm.


On Mon, Apr 01, 2013 at 10:25:23PM +0200, Michal Belczyk wrote:
> This looks like my _other_ patch I mentioned last time (*), except that the
> suggested default value is different, doesn't it?
> 
> (*) http://www.mail-archive.com/nbd-general@lists.sourceforge.net/msg01314.html
> 
> On Mon, Apr 01, 2013 at 02:41:43PM -0400, Paul Clements wrote:
> > I'm looking at this right now. I just need to test and decide what the
> > default should be, and I'll send this upstream.
> > 
> > Thanks,
> > Paul
> > 
> > On Mon, Apr 1, 2013 at 1:45 PM, Rohan Sharma <rickyrohan14@...58...> wrote:
> > > My last message didn?t show up properly due to some formatting errors.
> > > So, I am sending it again
> > >
> > > I am using nbd over high latency network (100 ms ).
> > > Currently maximum size of nbd io operation(amount of data fetched in one
> > > request)
> > > I can achieve is 130kb and it gives very poor disk performance.
> > > I tried recompiling nbd driver code so as to increase max_sector_kb property
> > > of disk queue.
> > > I added following two lines to nbd_init function
> > >               blk_queue_max_hw_sectors(disk->queue, 65536);
> > >               disk->queue->limits.max_sectors = 4096;
> > > But these modifications changed nothing.
> > > Do you have any idea what can I do to increase size of nbd io operations?
> > > I would like it to go as high as 4MB.
> > >
> > > Thanks
> > >
> > >
> > >
> > >
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> -- 
> Michal Belczyk Sr.
> 
> ------------------------------------------------------------------------------
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> Rise to greatness in Intel's independent game demo contest.
> Compete for recognition, cash, and the chance to get your game 
> on Steam. $5K grand prize plus 10 genre and skill prizes. 
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Folkert van Heusden

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