Re: RBD performance - tuning hints

[Dieter Kasper <d.kasper@kabelmail.de>]

Hi Alexandre,

with the 4 filestore parameter below some fio values could be increased:
  filestore max sync interval = 30
  filestore min sync interval = 29
  filestore flusher = false
  filestore queue max ops = 10000

###### IOPS 
fio_read_4k_64:              9373 
fio_read_4k_128:             9939 
fio_randwrite_8k_16:        12376 
fio_randwrite_4k_16:        13315 
fio_randwrite_512_32:       13660 
fio_randwrite_8k_32:        17318 
fio_randwrite_4k_32:        18057 
fio_randwrite_8k_64:        19693 
fio_randwrite_512_64:       20015 	<<<
fio_randwrite_4k_64:        20024 	<<<
fio_randwrite_8k_128:       20547 	<<<
fio_randwrite_4k_128:       20839 	<<<
fio_randwrite_512_128:      21417 	<<<
fio_randread_8k_128:        48872 
fio_randread_4k_128:        50002 
fio_randread_512_128:       51202 

###### MB/s 
fio_randread_2m_32:           628 
fio_read_4m_64:               630 
fio_randread_8m_32:           633 
fio_read_2m_32:               637 
fio_read_4m_16:               640 
fio_randread_4m_16:           652 
fio_write_2m_32:              660 
fio_randread_4m_32:           677 
fio_read_4m_32:               678 
(...)
fio_write_4m_64:              771 
fio_randwrite_2m_64:          789 
fio_write_8m_128:             796 
fio_write_4m_32:              802 
fio_randwrite_4m_128:         807 	<<<
fio_randwrite_2m_32:          811 	<<<
fio_write_2m_128:             833 	<<<
fio_write_8m_64:              901 	<<<

Best Regards,
-Dieter


On Wed, Aug 29, 2012 at 10:50:12AM +0200, Alexandre DERUMIER wrote:
> Nice results !
> (can you make same benchmark from a qemu-kvm guest with virtio-driver ? 
> I have made some bench some month ago with stephan priebe, and we never be able to have more than 20000iops, with a full ssd 3nodes cluster)
> 
> >>How can I set the variables when the Journal data have go to the OSD ? (after X seconds and/or when Y %-full) 
> I think you can try to tune these values
> 
> filestore max sync interval = 30
> filestore min sync interval = 29
> filestore flusher = false
> filestore queue max ops = 10000
> 
> 
> 
> ----- Mail original ----- 
> 
> De: "Dieter Kasper" <d.kasper@kabelmail.de> 
> À: ceph-devel@vger.kernel.org 
> Cc: "Dieter Kasper (KD)" <d.kasper@kabelmail.de> 
> Envoyé: Mardi 28 Août 2012 19:48:42 
> Objet: RBD performance - tuning hints 
> 
> Hi, 
> 
> on my 4-node system (SSD + 10GbE, see bench-config.txt for details) 
> I can observe a pretty nice rados bench performance 
> (see bench-rados.txt for details): 
> 
> Bandwidth (MB/sec): 961.710 
> Max bandwidth (MB/sec): 1040 
> Min bandwidth (MB/sec): 772 
> 
> 
> Also the bandwidth performance generated with 
> fio --filename=/dev/rbd1 --direct=1 --rw=$io --bs=$bs --size=2G --iodepth=$threads --ioengine=libaio --runtime=60 --group_reporting --name=file1 --output=fio_${io}_${bs}_${threads} 
> 
> .... is acceptable, e.g. 
> fio_write_4m_16 795 MB/s 
> fio_randwrite_8m_128 717 MB/s 
> fio_randwrite_8m_16 714 MB/s 
> fio_randwrite_2m_32 692 MB/s 
> 
> 
> But, the write IOPS seems to be limited around 19k ... 
> RBD 4M 64k (= optimal_io_size) 
> fio_randread_512_128 53286 55925 
> fio_randread_4k_128 51110 44382 
> fio_randread_8k_128 30854 29938 
> fio_randwrite_512_128 18888 2386 
> fio_randwrite_512_64 18844 2582 
> fio_randwrite_8k_64 17350 2445 
> (...) 
> fio_read_4k_128 10073 53151 
> fio_read_4k_64 9500 39757 
> fio_read_4k_32 9220 23650 
> (...) 
> fio_read_4k_16 9122 14322 
> fio_write_4k_128 2190 14306 
> fio_read_8k_32 706 13894 
> fio_write_4k_64 2197 12297 
> fio_write_8k_64 3563 11705 
> fio_write_8k_128 3444 11219 
> 
> 
> Any hints for tuning the IOPS (read and/or write) would be appreciated. 
> 
> How can I set the variables when the Journal data have go to the OSD ? (after X seconds and/or when Y %-full) 
> 
> 
> Kind Regards, 
> -Dieter 
> 
> 
> 
> -- 
> 
> -- 
> 
> 
> 
> 	
> 
> Alexandre D e rumier 
> 
> Ingénieur Systèmes et Réseaux 
> 
> 
> Fixe : 03 20 68 88 85 
> 
> Fax : 03 20 68 90 88 
> 
> 
> 45 Bvd du Général Leclerc 59100 Roubaix 
> 12 rue Marivaux 75002 Paris 
> --
> To unsubscribe from this list: send the line "unsubscribe ceph-devel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

--
To unsubscribe from this list: send the line "unsubscribe ceph-devel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html