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blk-mq with PCIe-SSD: No performance gain with 3.13-rc1 ?!
Hi all,
I just tried 3.13.0-999.201311250405_amd64 from the Ubuntu Kernel PPA to see if blk-mq will give me any performance plus with my PCIe SSD (Mushin Scorpion Deluxe 480G). With the simple benchmarks I used, however, it doesn't when compared to 3.12.0. To bench, I've used:
time dd if=/dev/zero of=test bs=1G count=32 oflag=direct && time dd if=test of=/dev/null bs=1G
tiotest -t 15 -f 2048 /dev/sdc3
fileop -f100
fio /tmp/fio-2.0.6/examples/ssd-test
time cp -r of a) 11.8G folder with ~77000 files b) 12g image file
Most of the results are within +/- 5% of the ones I got with 3.12.0 - that is, within the noise I'm seeing with these tests anyway.
I really don't have a reason to complain about the drive's performance, but I am curious on why I don't see any effects of blk-mq so far. So the questions are: Is blk-mq enabled by default with 3.13-rc1? If so, am I missing the point about blk-mq, meaning that I won't see any performance gain with this kind of single- or low-multithreaded applications anyway?! Did anyone else bench (PCIe) SSD performance with 3.13-rc1 yet?
Looking forward to your opinions! http://phoronix.com/forums/images/icons/icon7.png
Cheers,
gnartz
HW Specs
i7-3770k @ 4.7GHz
GA-Z77X-UD3H
16G DDR3-1333 7-7-7-18
AMD HD-5870
Mushkin Scorpion Deluxe 480G @ PCIe x8
Samsung 840 Pro 512G
Relevant OS Specs
Ubuntu 12.04 w/3.12.0-031200-generic & Gnome Fallback
Deadline Scheduler
EXT4, Journal, Writeback
I just tried 3.13.0-999.201311250405_amd64 from the Ubuntu Kernel PPA to see if blk-mq will give me any performance plus with my PCIe SSD (Mushin Scorpion Deluxe 480G). With the simple benchmarks I used, however, it doesn't when compared to 3.12.0. To bench, I've used:
time dd if=/dev/zero of=test bs=1G count=32 oflag=direct && time dd if=test of=/dev/null bs=1G
tiotest -t 15 -f 2048 /dev/sdc3
fileop -f100
fio /tmp/fio-2.0.6/examples/ssd-test
time cp -r of a) 11.8G folder with ~77000 files b) 12g image file
Most of the results are within +/- 5% of the ones I got with 3.12.0 - that is, within the noise I'm seeing with these tests anyway.
I really don't have a reason to complain about the drive's performance, but I am curious on why I don't see any effects of blk-mq so far. So the questions are: Is blk-mq enabled by default with 3.13-rc1? If so, am I missing the point about blk-mq, meaning that I won't see any performance gain with this kind of single- or low-multithreaded applications anyway?! Did anyone else bench (PCIe) SSD performance with 3.13-rc1 yet?
Looking forward to your opinions! http://phoronix.com/forums/images/icons/icon7.png
Cheers,
gnartz
HW Specs
i7-3770k @ 4.7GHz
GA-Z77X-UD3H
16G DDR3-1333 7-7-7-18
AMD HD-5870
Mushkin Scorpion Deluxe 480G @ PCIe x8
Samsung 840 Pro 512G
Relevant OS Specs
Ubuntu 12.04 w/3.12.0-031200-generic & Gnome Fallback
Deadline Scheduler
EXT4, Journal, Writeback