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gqman69
n00b
Joined: 11 Jul 2007
Posts: 50
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 Posted: Sun Jan 10, 2010 5:38 pm Post subject: 31 -> 32,32 Disk Throughput Regression? |
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So I have this new OCZ Vertex Turbo (30GB) SSD Hard drive and it works amazing.
But this is my problem, with kernel 2.6.31 everything work good,
hdparm -Tt, piozone, iozone, bonnie++ all gives me 215-230MB/s reads
and 140-170MB/s writes.
Using 2.6.32 things get ugly... Using the exact config, absolutely no change I get
100MB/s read and 80MB/s writes.
Now with 2.6.33_rcX I get even worse 78MB/s reads...
Yes I tried different schedulers, cfq is the best by far.
My question is WTH? |
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gqman69
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Joined: 11 Jul 2007
Posts: 50
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| Posted: Mon Jan 11, 2010 2:10 am Post subject: |
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This is what I got:
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[ 2.653505] ata1: SATA max UDMA/133 abar m2048@0xf3ffc000 port 0xf3ffc100 irq 33
[ 3.071424] ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[ 3.071607] ata1.00: ATA-8: OCZ VERTEX-TURBO, 1.4, max UDMA/133
[ 3.071609] ata1.00: 62533296 sectors, multi 1: LBA48 NCQ (depth 31/32), AA
[ 3.073328] ata1.00: configured for UDMA/133
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cach0rr0
Bodhisattva
Joined: 13 Nov 2008
Posts: 4123
Location: Houston, Republic of Texas
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gqman69
n00b
Joined: 11 Jul 2007
Posts: 50
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| Posted: Mon Jan 11, 2010 11:43 am Post subject: |
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It's is possible, but doesn't hdparm -Tt and piozone use block read and not the underlying filesystem?
It doesn't really explain the results of my second hard drive which is also EXT4 and which is not an SSD.
It gets steady 100MB/s to 80MB/s in a linear fashion with all kernels.
This is weird. |
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cach0rr0
Bodhisattva
Joined: 13 Nov 2008
Posts: 4123
Location: Houston, Republic of Texas
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| Posted: Mon Jan 11, 2010 11:56 am Post subject: |
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| gqman69 wrote: | It's is possible, but doesn't hdparm -Tt and piozone use block read and not the underlying filesystem?
It doesn't really explain the results of my second hard drive which is also EXT4 and which is not an SSD.
It gets steady 100MB/s to 80MB/s in a linear fashion with all kernels.
This is weird. |
you're quite right about hdparm, and in my haste to respond I completely overlooked that - sorry about that.
I just read the title and remembered "hey yeah, i remember reading something about that on Phoronix"
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gqman69
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Joined: 11 Jul 2007
Posts: 50
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| Posted: Tue Jan 12, 2010 4:44 pm Post subject: |
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So I tried zen-sources 2.6.32 with the BFQ scheduler...
I now get 130-140MB/s read with burst up to 180MB/s.
So this seems to be related to the scheduler.
It does somewhat confirm this article: http://www.linux-mag.com/id/7637 |
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