Re: [PATCH v3 0/5] block: loop: convert to blk-mq

[Sedat Dilek]

On Thu, Jan 1, 2015 at 1:01 AM, Ming Lei <tom.leiming@xxxxxxxxx> wrote:
> Hi Sedat,
>
> On Thu, Jan 1, 2015 at 6:32 AM, Sedat Dilek <sedat.dilek@xxxxxxxxx> wrote:
>> Forgot to CC LKML and linux-fsdevel.
>>
>> - Sedat -
>
>>
>> OK, I have installed fio (1.59-1) and libaio1 (0.3.109-2ubuntu1) here.
>>
>> You say in [1]:
>>
>> "In the following test:
>> - base: v3.19-rc2-2041231
>> - loop over file in ext4 file system on SSD disk
>> - bs: 4k, libaio, io depth: 64, O_DIRECT, num of jobs: 1
>> - throughput: IOPS"
>>
>> I tried to reproduce that inspired by [2]...
>>
>> root# fio --name=randread --rw=randread --bs=4k --ioengine=libaio
>> --iodepth=64 --direct=1 --numjobs=1 --size=1G
>>
>> ...you had no size given (here: 1GiB) - fio requires that parameter to run.
>>
>> This results in 165 VS. 515 IOPS here.
>
> Thanks for your test.
>
> Also if your disk is quick enough, you will observe improvement on
> read test too.
>

This is no SSD here.

# dmesg | egrep -i 'hitachi|ata1|sda'
[    0.457892] ata1: SATA max UDMA/133 abar m2048@0xf0708000 port
0xf0708100 irq 25
[    0.777445] ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[    0.778759] ata1.00: ATA-8: Hitachi HTS545050A7E380, GG2OA6C0, max UDMA/133
[    0.778778] ata1.00: 976773168 sectors, multi 16: LBA48 NCQ (depth 31/32), AA
[    0.780154] ata1.00: configured for UDMA/133
[    0.780970] scsi 0:0:0:0: Direct-Access     ATA      Hitachi
HTS54505 A6C0 PQ: 0 ANSI: 5
[    0.782050] sd 0:0:0:0: [sda] 976773168 512-byte logical blocks:
(500 GB/465 GiB)
[    0.782058] sd 0:0:0:0: [sda] 4096-byte physical blocks
[    0.782255] sd 0:0:0:0: [sda] Write Protect is off
[    0.782262] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
[    0.782339] sd 0:0:0:0: [sda] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA
[    0.800644]  sda: sda1 sda2 sda3
[    0.802029] sd 0:0:0:0: [sda] Attached SCSI disk

How did you test with fio (your fio lines)?

- Sedat -

>> # grep "iops=" test-*
>> test-1-next20141231.txt:  read : io=1024.0MB, bw=678578 B/s, iops=165
>> , runt=1582340msec
>> test-2-next20141231-block-mq-v3.txt:  read : io=1024.0MB,
>> bw=2063.4KB/s, iops=515 , runt=508182msec
>>
>> Full fio-logs and some other useful configs/logs/patches attached.
>>
>> - Sedat -
>>
>> [1] http://marc.info/?l=linux-kernel&m=142003220301459&w=2
>> [2] http://wiki.mikejung.biz/Benchmarking#Fio_Random_Write_Test_using_libaio_and_direct_flags
>
>
>
> Thanks,
> Ming Lei
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