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PostPosted: Tue Feb 03, 2009 1:55 pm 
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Hi, guys.

I tested my Kurobox Pro today with hdparm and found the disk speed was not very good.

Then I tried to boot my Kuro into the original firmware and it turned out like this:

~ # hdparm -tT /dev/sda

/dev/sda:
Timing buffer-cache reads: 128 MB in 0.87 seconds =147.13 MB/sec
Timing buffered disk reads: 64 MB in 3.32 seconds = 19.28 MB/sec

Then with the Armel Debian 2.6.26 kernal the buffer-cache reads is around 80MB and the buffered disk reads is around 22MB.

And I tried to change another 500GB Seagate disk for the test and nothing changed...

But I saw others in the forum and wiki had hdparm test speed around 35-40MB.

So what the problem might be?
Thanks in advance!

p.s. Mine is a Japanese model. Does that matter? I doubt that...


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PostPosted: Wed Feb 04, 2009 6:38 am 
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These are as expected. See this for info http://buffalo.nas-central.org/index.php/Benchmarks

I am sure that if anyone has been able to better this performance, then they would post here.

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PostPosted: Wed Feb 04, 2009 7:04 am 
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lb_worm wrote:
These are as expected. See this for info http://buffalo.nas-central.org/index.php/Benchmarks

I am sure that if anyone has been able to better this performance, then they would post here.

Hi, lb_worm

Thanks for the reply.
But the benchmarks page shows 47.84 MB/sec disk performance with Kurobox Pro but with a different firmware. I only got 20MB.
Should I try using different kernels to see how the performance would change?


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PostPosted: Wed Feb 04, 2009 9:03 am 
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Do hdparm -a1024 /dev/sda and try again.

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PostPosted: Wed Feb 04, 2009 12:55 pm 
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lb_worm wrote:
Do hdparm -a1024 /dev/sda and try again.

lb_worm, thanks for the reply.

I have managed to get 46.79 MB/sec by setting fs readahead to 2048 and turning off lookahead.

hdparm -A0 /dev/sda (turn off lookahead)
hdparm -a2048 /dev/sda (set fs readahead to 2048)

In my case, this gives the best result.

But I still do not understand. Does the hdparm test truly reflect hard disk (or maybe filesystem) performance?
In other words, should I make these changes permanent?
What about the cons and pros of setting large(small) fs readahead values and turning on(off) disk lookahead?

Anyway, thanks, lb_worm


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PostPosted: Sat Feb 07, 2009 8:02 am 
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I have tested samba today but the speed was only 19MB/s (with MTU of 9000 on both sides), lower than 37MB/s as someone pointed out on his LS Live.
Could that be the problem with my hard drive, since with the default settings, the read speed of my hard drive is also like 20MB/s.

This really confuses me. If anyone had any experience with it, I would be very much appreciated with your suggestions.

Oh, I was using davy_gravy's image(version 0.3.1b) and his kernal 2.6.27.4.

Thanks in advance.

Regards,
Robin


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PostPosted: Mon Feb 09, 2009 6:51 am 
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OK, to answer my own questions.

It seems the low disk performance in hdparm is related to hard drive models. Mine is WD3200YS which is a 24*7 model.
I tried to put my old Diamond Plus 10 into Kurobox Pro and it ran pretty fast @46MB/s with default hdparm settings.

I am not sure whether it is a disk firmware issue or a sata driver issue.

Regards,
Robin


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PostPosted: Mon Feb 09, 2009 1:28 pm 
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sledgehammer wrote:
I have tested samba today but the speed was only 19MB/s (with MTU of 9000 on both sides), lower than 37MB/s as someone pointed out on his LS Live.
Could that be the problem with my hard drive, since with the default settings, the read speed of my hard drive is also like 20MB/s.

This really confuses me. If anyone had any experience with it, I would be very much appreciated with your suggestions.

Oh, I was using davy_gravy's image(version 0.3.1b) and his kernal 2.6.27.4.



sledgehammer, thanks for your inquisitiveness and insight... even if you seemed like you ended up answering your own question, it has confirmed something for us all. It seems that JumboFrames is the way to go...

You confirming what ahagge (thanks to him, also) had mentioned is useful, and seems to indicate that the slower network speeds with the vanilla ARM kernels can be improved drastically using the proper MTU settings.

Please, if others experiment with this, post your findings?! A lot of us have been pining for better speeds under the vanilla kernel. Maybe this is our answer/gateway. ;)

EDIT: If possible, please list your kernel version, MTU setting, GbE card on desktop/laptop that you are running the transfers to/from. I'm guessing also that number won't look as impressive if the network happens to have a single non-gigabit device on it(?).

_________________
LS1 (foonas, nfs, Tranmission & p910nd print server, Firefly for my Roku)
LS-HG500 (Lenny)
Various LS-Pros v1,v2 (unbricked w/ serial & jtag)
KuroPro, LS2 & KuroHG (foonas)
Working on davysweather.dyndns.org lately...

=> wooohooo!
wooohooo!
Unknown command 'wooohooo!' - try 'help'


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