Re: [Nbd] NBD Super Size io operations
People,
I did it wrong.
This is correct:
previously version (stock 3.8 with signal patch) with 4KB nbd, 128KB iozone3:
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
current version with 4KB nbd, 128KB iozone3:
random random bkwd record stride
KB reclen write rewrite read reread read write read rewrite read fwrite frewrite fread freread
2097152 128 33933 35063 116522 117882 114987 34607 116599 36000 116012 55279 55677 116960 116745
current version with 128KB nbd, 128KB iozone3:
random random bkwd record stride
KB reclen write rewrite read reread read write read rewrite read fwrite frewrite fread freread
2097152 128 35664 35674 123922 122845 126486 36151 112671 35884 118069 53315 59279 115894 117202
current version with 128KB nbd, 1024KB iozone3:
random random bkwd record stride
KB reclen write rewrite read reread read write read rewrite read fwrite frewrite fread freread
2097152 1024 33705 35078 131637 136712 136685 35152 139128 38010 148841 59181 57372 121299 113432
current version with 1024KB nbd, 1024KB iozone3:
random random bkwd record stride
KB reclen write rewrite read reread read write read rewrite read fwrite frewrite fread freread
2097152 1024 34208 33322 138010 136586 136461 35383 139139 36043 131382 55621 57448 116226 117450
so I don't see any logic in it
On Tue, Apr 02, 2013 at 04:07:07PM +0200, folkert wrote:
> 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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> >
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>
> Folkert van Heusden
>
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