http://xdel.ru/downloads/ceph-logs-dbg/
On Fri, Mar 23, 2012 at 9:53 PM, Samuel Just <sam.j...@dreamhost.com> wrote: > (CCing the list) > > Actually, can you could re-do the rados bench run with 'debug journal > = 20' along with the other debugging? That should give us better > information. > > -Sam > > On Fri, Mar 23, 2012 at 5:25 AM, Andrey Korolyov <and...@xdel.ru> wrote: >> Hi Sam, >> >> Can you please suggest on where to start profiling osd? If the >> bottleneck has related to such non-complex things as directio speed, >> I`m sure that I was able to catch it long ago, even crossing around by >> results of other types of benchmarks at host system. I`ve just tried >> tmpfs under both journals, it has a small boost effect, as expected >> because of near-zero i/o delay. May be chunk distribution mechanism >> does not work well on such small amount of nodes but right now I don`t >> have necessary amount of hardware nodes to prove or disprove that. >> >> On Thu, Mar 22, 2012 at 10:40 PM, Andrey Korolyov <and...@xdel.ru> wrote: >>> random-rw: (g=0): rw=write, bs=4K-4K/4K-4K, ioengine=sync, iodepth=2 >>> Starting 1 process >>> Jobs: 1 (f=1): [W] [100.0% done] [0K/35737K /s] [0/8725 iops] [eta 00m:00s] >>> random-rw: (groupid=0, jobs=1): err= 0: pid=9647 >>> write: io=163840KB, bw=37760KB/s, iops=9439, runt= 4339msec >>> clat (usec): min=70, max=39801, avg=104.19, stdev=324.29 >>> bw (KB/s) : min=30480, max=43312, per=98.83%, avg=37317.00, stdev=5770.28 >>> cpu : usr=1.84%, sys=13.00%, ctx=40961, majf=0, minf=26 >>> IO depths : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >>> >=64=0.0% >>> submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >>> >=64=0.0% >>> complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >>> >=64=0.0% >>> issued r/w: total=0/40960, short=0/0 >>> lat (usec): 100=79.69%, 250=19.89%, 500=0.12%, 750=0.12%, 1000=0.11% >>> lat (msec): 2=0.01%, 4=0.01%, 10=0.03%, 20=0.01%, 50=0.01% >>> >>> >>> On Thu, Mar 22, 2012 at 9:26 PM, Samuel Just <sam.j...@dreamhost.com> wrote: >>>> Our journal writes are actually sequential. Could you send FIO >>>> results for sequential 4k writes osd.0's journal and osd.1's journal? >>>> -Sam >>>> >>>> On Thu, Mar 22, 2012 at 5:21 AM, Andrey Korolyov <and...@xdel.ru> wrote: >>>>> FIO output for journal partition, directio enabled, seems good(same >>>>> results for ext4 on other single sata disks). >>>>> >>>>> random-rw: (g=0): rw=randwrite, bs=4K-4K/4K-4K, ioengine=sync, iodepth=2 >>>>> Starting 1 process >>>>> Jobs: 1 (f=1): [w] [100.0% done] [0K/3219K /s] [0/786 iops] [eta 00m:00s] >>>>> random-rw: (groupid=0, jobs=1): err= 0: pid=21926 >>>>> write: io=163840KB, bw=2327KB/s, iops=581, runt= 70403msec >>>>> clat (usec): min=122, max=441551, avg=1714.52, stdev=7565.04 >>>>> bw (KB/s) : min= 552, max= 3880, per=100.61%, avg=2341.23, >>>>> stdev=480.05 >>>>> cpu : usr=0.42%, sys=1.34%, ctx=40976, majf=0, minf=42 >>>>> IO depths : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >>>>> >=64=0.0% >>>>> submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >>>>> >=64=0.0% >>>>> complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >>>>> >=64=0.0% >>>>> issued r/w: total=0/40960, short=0/0 >>>>> lat (usec): 250=31.70%, 500=0.68%, 750=0.10%, 1000=0.63% >>>>> lat (msec): 2=41.31%, 4=20.91%, 10=4.40%, 20=0.17%, 50=0.07% >>>>> lat (msec): 500=0.04% >>>>> >>>>> >>>>> >>>>> On Thu, Mar 22, 2012 at 1:20 AM, Samuel Just <sam.j...@dreamhost.com> >>>>> wrote: >>>>>> (CCing the list) >>>>>> >>>>>> So, the problem isn't the bandwidth. Before we respond to the client, >>>>>> we write the operation to the journal. In this case, that operation >>>>>> is taking >1s per operation on osd.1. Both rbd and rados bench will >>>>>> only allow a limited number of ops in flight at a time, so this >>>>>> latency is killing your throughput. For comparison, the latency for >>>>>> writing to the journal on osd.0 is < .3s. Can you measure direct io >>>>>> latency for writes to your osd.1 journal file? >>>>>> -Sam >>>>>> >>>>>> On Wed, Mar 21, 2012 at 1:56 PM, Andrey Korolyov <and...@xdel.ru> wrote: >>>>>>> Oh, you may confuse with Zabbix metrics - y-axis means Megabytes/s, >>>>>>> not Megabits. >>>>>>> >>>>>>> On Thu, Mar 22, 2012 at 12:53 AM, Andrey Korolyov <and...@xdel.ru> >>>>>>> wrote: >>>>>>>> [global] >>>>>>>> log dir = /ceph/out >>>>>>>> log_file = "" >>>>>>>> logger dir = /ceph/log >>>>>>>> pid file = /ceph/out/$type$id.pid >>>>>>>> [mds] >>>>>>>> pid file = /ceph/out/$name.pid >>>>>>>> lockdep = 1 >>>>>>>> mds log max segments = 2 >>>>>>>> [osd] >>>>>>>> lockdep = 1 >>>>>>>> filestore_xattr_use_omap = 1 >>>>>>>> osd data = /ceph/dev/osd$id >>>>>>>> osd journal = /ceph/meta/journal >>>>>>>> osd journal size = 100 >>>>>>>> [mon] >>>>>>>> lockdep = 1 >>>>>>>> mon data = /ceph/dev/mon$id >>>>>>>> [mon.0] >>>>>>>> host = 172.20.1.32 >>>>>>>> mon addr = 172.20.1.32:6789 >>>>>>>> [mon.1] >>>>>>>> host = 172.20.1.33 >>>>>>>> mon addr = 172.20.1.33:6789 >>>>>>>> [mon.2] >>>>>>>> host = 172.20.1.35 >>>>>>>> mon addr = 172.20.1.35:6789 >>>>>>>> [osd.0] >>>>>>>> host = 172.20.1.32 >>>>>>>> [osd.1] >>>>>>>> host = 172.20.1.33 >>>>>>>> [mds.a] >>>>>>>> host = 172.20.1.32 >>>>>>>> >>>>>>>> /dev/sda1 on /ceph type ext4 (rw,barrier=0,user_xattr) >>>>>>>> /dev/mapper/system-cephmeta on /ceph/meta type ext4 >>>>>>>> (rw,barrier=0,user_xattr) >>>>>>>> Simple performance tests on those fs shows ~133Mb/s for /ceph and >>>>>>>> metadata/. Also both machines do not hold anything else which may >>>>>>>> impact osd. >>>>>>>> >>>>>>>> Also please note of following: >>>>>>>> >>>>>>>> http://i.imgur.com/ZgFdO.png >>>>>>>> >>>>>>>> First two peaks are related to running rados bench, then goes cluster >>>>>>>> recreation, automated debian install and final peaks are dd test. >>>>>>>> Surely I can have more precise graphs, but current one probably enough >>>>>>>> to state a situation - rbd utilizing about a quarter of possible >>>>>>>> bandwidth(if we can count rados bench as 100%). >>>>>>>> >>>>>>>> On Thu, Mar 22, 2012 at 12:39 AM, Samuel Just <sam.j...@dreamhost.com> >>>>>>>> wrote: >>>>>>>>> Hmm, there seem to be writes taking as long as 1.5s to hit journal on >>>>>>>>> osd.1... Could you post your ceph.conf? Might there be a problem >>>>>>>>> with the osd.1 journal disk? >>>>>>>>> -Sam >>>>>>>>> >>>>>>>>> On Wed, Mar 21, 2012 at 1:25 PM, Andrey Korolyov <and...@xdel.ru> >>>>>>>>> wrote: >>>>>>>>>> Oh, sorry - they probably inherited rights from log files, fixed. >>>>>>>>>> >>>>>>>>>> On Thu, Mar 22, 2012 at 12:17 AM, Samuel Just >>>>>>>>>> <sam.j...@dreamhost.com> wrote: >>>>>>>>>>> I get 403 Forbidden when I try to download any of the files. >>>>>>>>>>> -Sam >>>>>>>>>>> >>>>>>>>>>> On Wed, Mar 21, 2012 at 11:51 AM, Andrey Korolyov <and...@xdel.ru> >>>>>>>>>>> wrote: >>>>>>>>>>>> http://xdel.ru/downloads/ceph-logs/ >>>>>>>>>>>> >>>>>>>>>>>> 1/ contains logs related to bench initiated at the osd0 machine >>>>>>>>>>>> and 2/ >>>>>>>>>>>> - at osd1. >>>>>>>>>>>> >>>>>>>>>>>> On Wed, Mar 21, 2012 at 8:54 PM, Samuel Just >>>>>>>>>>>> <sam.j...@dreamhost.com> wrote: >>>>>>>>>>>>> Hmm, I'm seeing some very high latency on ops sent to osd.1. Can >>>>>>>>>>>>> you >>>>>>>>>>>>> post osd.1's logs? >>>>>>>>>>>>> -Sam >>>>>>>>>>>>> >>>>>>>>>>>>> On Wed, Mar 21, 2012 at 3:51 AM, Andrey Korolyov <and...@xdel.ru> >>>>>>>>>>>>> wrote: >>>>>>>>>>>>>> Here, please: http://xdel.ru/downloads/ceph.log.gz >>>>>>>>>>>>>> >>>>>>>>>>>>>> Sometimes 'cur MB/s ' shows zero during rados bench, even if any >>>>>>>>>>>>>> debug >>>>>>>>>>>>>> output disabled and log_file set to the empty value, hope it`s >>>>>>>>>>>>>> okay. >>>>>>>>>>>>>> >>>>>>>>>>>>>> On Wed, Mar 21, 2012 at 2:36 AM, Samuel Just >>>>>>>>>>>>>> <sam.j...@dreamhost.com> wrote: >>>>>>>>>>>>>>> Can you set osd and filestore debugging to 20, restart the >>>>>>>>>>>>>>> osds, run >>>>>>>>>>>>>>> rados bench as before, and post the logs? >>>>>>>>>>>>>>> -Sam Just >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> On Tue, Mar 20, 2012 at 1:37 PM, Andrey Korolyov >>>>>>>>>>>>>>> <and...@xdel.ru> wrote: >>>>>>>>>>>>>>>> rados bench 60 write -p data >>>>>>>>>>>>>>>> <skip> >>>>>>>>>>>>>>>> Total time run: 61.217676 >>>>>>>>>>>>>>>> Total writes made: 989 >>>>>>>>>>>>>>>> Write size: 4194304 >>>>>>>>>>>>>>>> Bandwidth (MB/sec): 64.622 >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> Average Latency: 0.989608 >>>>>>>>>>>>>>>> Max latency: 2.21701 >>>>>>>>>>>>>>>> Min latency: 0.255315 >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> Here a snip from osd log, seems write size is okay. >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> 2012-03-21 00:00:39.397066 7fdda86a7700 osd.0 10 pg[0.58( v >>>>>>>>>>>>>>>> 10'83 >>>>>>>>>>>>>>>> (0'0,10'83] n=50 ec=1 les/c 9/9 8/8/6) [0,1] r=0 lpr=8 mlcod >>>>>>>>>>>>>>>> 10'82 >>>>>>>>>>>>>>>> active+clean] removing repgather(0x31b5360 applying 10'83 >>>>>>>>>>>>>>>> rep_tid=597 >>>>>>>>>>>>>>>> wfack= wfdisk= op=osd_op(client.4599.0:2533 >>>>>>>>>>>>>>>> rb.0.2.000000000040 [write >>>>>>>>>>>>>>>> 1220608~4096] 0.17eb9fd8) v4) >>>>>>>>>>>>>>>> 2012-03-21 00:00:39.397086 7fdda86a7700 osd.0 10 pg[0.58( v >>>>>>>>>>>>>>>> 10'83 >>>>>>>>>>>>>>>> (0'0,10'83] n=50 ec=1 les/c 9/9 8/8/6) [0,1] r=0 lpr=8 mlcod >>>>>>>>>>>>>>>> 10'82 >>>>>>>>>>>>>>>> active+clean] q front is repgather(0x31b5360 applying 10'83 >>>>>>>>>>>>>>>> rep_tid=597 wfack= wfdisk= op=osd_op(client.4599.0:2533 >>>>>>>>>>>>>>>> rb.0.2.000000000040 [write 1220608~4096] 0.17eb9fd8) v4) >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> Sorry for my previous question about rbd chunks, it was really >>>>>>>>>>>>>>>> stupid :) >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> On Mon, Mar 19, 2012 at 10:40 PM, Josh Durgin >>>>>>>>>>>>>>>> <josh.dur...@dreamhost.com> wrote: >>>>>>>>>>>>>>>>> On 03/19/2012 11:13 AM, Andrey Korolyov wrote: >>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>> Nope, I`m using KVM for rbd guests. Surely I`ve been noticed >>>>>>>>>>>>>>>>>> that Sage >>>>>>>>>>>>>>>>>> mentioned too small value and I`ve changed it to 64M before >>>>>>>>>>>>>>>>>> posting >>>>>>>>>>>>>>>>>> previous message with no success - both 8M and this value >>>>>>>>>>>>>>>>>> cause a >>>>>>>>>>>>>>>>>> performance drop. When I tried to wrote small amount of data >>>>>>>>>>>>>>>>>> that can >>>>>>>>>>>>>>>>>> be compared to writeback cache size(both on raw device and >>>>>>>>>>>>>>>>>> ext3 with >>>>>>>>>>>>>>>>>> sync option), following results were made: >>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>> I just want to clarify that the writeback window isn't a full >>>>>>>>>>>>>>>>> writeback >>>>>>>>>>>>>>>>> cache - it doesn't affect reads, and does not help with >>>>>>>>>>>>>>>>> request merging etc. >>>>>>>>>>>>>>>>> It simply allows a bunch of writes to be in flight while >>>>>>>>>>>>>>>>> acking the write to >>>>>>>>>>>>>>>>> the guest immediately. We're working on a full-fledged >>>>>>>>>>>>>>>>> writeback cache that >>>>>>>>>>>>>>>>> to replace the writeback window. >>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>> dd if=/dev/zero of=/var/img.1 bs=10M count=10 oflag=direct >>>>>>>>>>>>>>>>>> (almost >>>>>>>>>>>>>>>>>> same without oflag there and in the following samples) >>>>>>>>>>>>>>>>>> 10+0 records in >>>>>>>>>>>>>>>>>> 10+0 records out >>>>>>>>>>>>>>>>>> 104857600 bytes (105 MB) copied, 0.864404 s, 121 MB/s >>>>>>>>>>>>>>>>>> dd if=/dev/zero of=/var/img.1 bs=10M count=20 oflag=direct >>>>>>>>>>>>>>>>>> 20+0 records in >>>>>>>>>>>>>>>>>> 20+0 records out >>>>>>>>>>>>>>>>>> 209715200 bytes (210 MB) copied, 6.67271 s, 31.4 MB/s >>>>>>>>>>>>>>>>>> dd if=/dev/zero of=/var/img.1 bs=10M count=30 oflag=direct >>>>>>>>>>>>>>>>>> 30+0 records in >>>>>>>>>>>>>>>>>> 30+0 records out >>>>>>>>>>>>>>>>>> 314572800 bytes (315 MB) copied, 12.4806 s, 25.2 MB/s >>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>> and so on. Reference test with bs=1M and count=2000 has >>>>>>>>>>>>>>>>>> slightly worse >>>>>>>>>>>>>>>>>> results _with_ writeback cache than without, as I`ve >>>>>>>>>>>>>>>>>> mentioned before. >>>>>>>>>>>>>>>>>> Here the bench results, they`re almost equal on both nodes: >>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>> bench: wrote 1024 MB in blocks of 4096 KB in 9.037468 sec at >>>>>>>>>>>>>>>>>> 113 MB/sec >>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>> One thing to check is the size of the writes that are >>>>>>>>>>>>>>>>> actually being sent by >>>>>>>>>>>>>>>>> rbd. The guest is probably splitting them into relatively >>>>>>>>>>>>>>>>> small (128 or >>>>>>>>>>>>>>>>> 256k) writes. Ideally it would be sending 4k writes, and this >>>>>>>>>>>>>>>>> should be a >>>>>>>>>>>>>>>>> lot faster. >>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>> You can see the writes being sent by adding debug_ms=1 to the >>>>>>>>>>>>>>>>> client or osd. >>>>>>>>>>>>>>>>> The format is osd_op(.*[write OFFSET~LENGTH]). >>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>> Also, because I`ve not mentioned it before, network >>>>>>>>>>>>>>>>>> performance is >>>>>>>>>>>>>>>>>> enough to hold fair gigabit connectivity with MTU 1500. >>>>>>>>>>>>>>>>>> Seems that it >>>>>>>>>>>>>>>>>> is not interrupt problem or something like it - even if >>>>>>>>>>>>>>>>>> ceph-osd, >>>>>>>>>>>>>>>>>> ethernet card queues and kvm instance pinned to different >>>>>>>>>>>>>>>>>> sets of >>>>>>>>>>>>>>>>>> cores, nothing changes. >>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>> On Mon, Mar 19, 2012 at 8:59 PM, Greg Farnum >>>>>>>>>>>>>>>>>> <gregory.far...@dreamhost.com> wrote: >>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>> It sounds like maybe you're using Xen? The "rbd writeback >>>>>>>>>>>>>>>>>>> window" option >>>>>>>>>>>>>>>>>>> only works for userspace rbd implementations (eg, KVM). >>>>>>>>>>>>>>>>>>> If you are using KVM, you probably want 81920000 (~80MB) >>>>>>>>>>>>>>>>>>> rather than >>>>>>>>>>>>>>>>>>> 8192000 (~8MB). >>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>> What options are you running dd with? If you run a rados >>>>>>>>>>>>>>>>>>> bench from both >>>>>>>>>>>>>>>>>>> machines, what do the results look like? >>>>>>>>>>>>>>>>>>> Also, can you do the ceph osd bench on each of your OSDs, >>>>>>>>>>>>>>>>>>> please? >>>>>>>>>>>>>>>>>>> (http://ceph.newdream.net/wiki/Troubleshooting#OSD_performance) >>>>>>>>>>>>>>>>>>> -Greg >>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>> On Monday, March 19, 2012 at 6:46 AM, Andrey Korolyov wrote: >>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>> More strangely, writing speed drops down by fifteen >>>>>>>>>>>>>>>>>>>> percent when this >>>>>>>>>>>>>>>>>>>> option was set in vm` config(instead of result from >>>>>>>>>>>>>>>>>>>> http://www.mail-archive.com/ceph-devel@vger.kernel.org/msg03685.html). >>>>>>>>>>>>>>>>>>>> As I mentioned, I`m using 0.43, but due to crashed osds, >>>>>>>>>>>>>>>>>>>> ceph has been >>>>>>>>>>>>>>>>>>>> recompiled with e43546dee9246773ffd6877b4f9495f1ec61cd55 >>>>>>>>>>>>>>>>>>>> and >>>>>>>>>>>>>>>>>>>> 1468d95101adfad44247016a1399aab6b86708d2 - both cases >>>>>>>>>>>>>>>>>>>> caused crashes >>>>>>>>>>>>>>>>>>>> under heavy load. >>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>> On Sun, Mar 18, 2012 at 10:22 PM, Sage >>>>>>>>>>>>>>>>>>>> Weil<s...@newdream.net >>>>>>>>>>>>>>>>>>>> (mailto:s...@newdream.net)> wrote: >>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>>> On Sat, 17 Mar 2012, Andrey Korolyov wrote: >>>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>>>> Hi, >>>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>>>> I`ve did some performance tests at the following >>>>>>>>>>>>>>>>>>>>>> configuration: >>>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>>>> mon0, osd0 and mon1, osd1 - two twelve-core r410 with >>>>>>>>>>>>>>>>>>>>>> 32G ram, mon2 - >>>>>>>>>>>>>>>>>>>>>> dom0 with three dedicated cores and 1.5G, mostly idle. >>>>>>>>>>>>>>>>>>>>>> First three >>>>>>>>>>>>>>>>>>>>>> disks on each r410 arranged into raid0 and holds osd >>>>>>>>>>>>>>>>>>>>>> data when fourth >>>>>>>>>>>>>>>>>>>>>> holds os and osd` journal partition, all ceph-related >>>>>>>>>>>>>>>>>>>>>> stuff mounted on >>>>>>>>>>>>>>>>>>>>>> the ext4 without barriers. >>>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>>>> Firstly, I`ve noticed about a difference of benchmark >>>>>>>>>>>>>>>>>>>>>> performance and >>>>>>>>>>>>>>>>>>>>>> write speed through rbd from small kvm instance running >>>>>>>>>>>>>>>>>>>>>> on one of >>>>>>>>>>>>>>>>>>>>>> first two machines - when bench gave me about 110Mb/s, >>>>>>>>>>>>>>>>>>>>>> writing zeros >>>>>>>>>>>>>>>>>>>>>> to raw block device inside vm with dd was at top speed >>>>>>>>>>>>>>>>>>>>>> about 45 mb/s, >>>>>>>>>>>>>>>>>>>>>> for vm`fs (ext4 with default options) performance drops >>>>>>>>>>>>>>>>>>>>>> to ~23Mb/s. >>>>>>>>>>>>>>>>>>>>>> Things get worse, when I`ve started second vm at second >>>>>>>>>>>>>>>>>>>>>> host and tried >>>>>>>>>>>>>>>>>>>>>> to continue same dd tests simultaneously - performance >>>>>>>>>>>>>>>>>>>>>> fairly divided >>>>>>>>>>>>>>>>>>>>>> by half for each instance :). Enabling jumbo frames, >>>>>>>>>>>>>>>>>>>>>> playing with cpu >>>>>>>>>>>>>>>>>>>>>> affinity for ceph and vm instances and trying different >>>>>>>>>>>>>>>>>>>>>> TCP congestion >>>>>>>>>>>>>>>>>>>>>> protocols gave no effect at all - with DCTCP I have >>>>>>>>>>>>>>>>>>>>>> slightly smoother >>>>>>>>>>>>>>>>>>>>>> network load graph and that`s all. >>>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>>>> Can ml please suggest anything to try to improve >>>>>>>>>>>>>>>>>>>>>> performance? >>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>>> Can you try setting >>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>>> rbd writeback window = 8192000 >>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>>> or similar, and see what kind of effect that has? I >>>>>>>>>>>>>>>>>>>>> suspect it'll speed >>>>>>>>>>>>>>>>>>>>> up dd; I'm less sure about ext3. >>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>>> Thanks! >>>>>>>>>>>>>>>>>>>>> sage >>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>>>> ceph-0.43, libvirt-0.9.8, qemu-1.0.0, kernel 3.2 >>>>>>>>>>>>>>>>>>>>>> -- >>>>>>>>>>>>>>>>>>>>>> To unsubscribe from this list: send the line >>>>>>>>>>>>>>>>>>>>>> "unsubscribe ceph-devel" >>>>>>>>>>>>>>>>>>>>>> in >>>>>>>>>>>>>>>>>>>>>> the body of a message to majord...@vger.kernel.org >>>>>>>>>>>>>>>>>>>>>> (mailto:majord...@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 majord...@vger.kernel.org >>>>>>>>>>>>>>>>>>>> (mailto:majord...@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 majord...@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 majord...@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 majord...@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 majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
