hdparm results??

greg32 · Posted: Tue Jul 29, 2003 10:38 pm Post subject: hdparm results??

Do these hdparm results look right to you? Especially the cache reads:
Both drives are Western Digital 80gig drives , 7200rpm and *mb cache.
localhost root # hdparm -tT /dev/hda

/dev/hda:
Timing buffer-cache reads: 2764 MB in 2.00 seconds = 1380.14 MB/sec
Timing buffered disk reads: 138 MB in 3.01 seconds = 45.87 MB/sec
localhost root # hdparm -tT /dev/hdc

/dev/hdc:
Timing buffer-cache reads: 2768 MB in 2.00 seconds = 1384.21 MB/sec
Timing buffered disk reads: 140 MB in 3.02 seconds = 46.29 MB/sec
localhost root #

Verteron · Apprentice Joined: 23 Jul 2003 Posts: 189

Looks very good for an IDE driver to me. There's a big thread on this, let me find it for you a second...

Verteron · Apprentice Joined: 23 Jul 2003 Posts: 189

Have a look here: The Filesystem Of Choice. Most people seem to be getting b/w 40-45MB/s with all the correct DMA/IO options turned on.

FWIW, your buffer cache reads look much better than a lot I've seen, maybe you've got a WD special edition with the 8MB cache? Nice disk...

greg32 · Posted: Tue Jul 29, 2003 11:05 pm Post subject:

yeah, so disk reads are about normal, but I would think the cache reads must be inaccurate!?? They are a little high. The drive does have an 8mb cache, but I still think hdparm is inacurate.

I am running reiserfs btw.

greg

idl · Posted: Tue Jul 29, 2003 11:43 pm Post subject:

I have the same drive (Caviar) and my buffer cache reads are no way near yours. I've never seen reads that high!

sindre · Guru Joined: 01 Nov 2002 Posts: 315 Location: Norway

this is on a seagate baracuda v5 IDE 7200rpm 80GB 2MB cache disk.

Moled · l33t Joined: 09 Jul 2003 Posts: 635

highest mine have done is 1066.67 mb/sec and ~56mb/sec

Ian · Posted: Wed Jul 30, 2003 4:07 am Post subject:

i'm getting horrible readings with 2.6.0-test1...

hdparm -tT /dev/hdb

Moled · l33t Joined: 09 Jul 2003 Posts: 635

using_dma = 0 (off)
O_o

Moled · l33t Joined: 09 Jul 2003 Posts: 635

\o/
my box fixed itself,

/dev/sda:
Timing buffer-cache reads: 3892 MB in 2.00 seconds = 1946.00 MB/sec
Timing buffered disk reads: 164 MB in 3.00 seconds = 54.67 MB/sec

Ian · Posted: Wed Jul 30, 2003 10:42 pm Post subject:

I think there's definitely something wrong with 2.6-pre series, as I can't use hdparm to enabled DMA. Either that, or there's a new kernel option...

I'll try playing with the kernel, see what I come up with.

nike · n00b Joined: 30 Jul 2003 Posts: 12

whap parameters shoud i give hdparm to get best perfomance

hdparm ?

now i have:
/dev/hda7:
Timing buffer-cache reads: 128 MB in 1.08 seconds =118.52 MB/sec
Timing buffered disk reads: 64 MB in 3.18 seconds = 20.13 MB/sec

nike · n00b Joined: 30 Jul 2003 Posts: 12

forgoten ----

/dev/hda7:
multcount = 16 (on)
IO_support = 1 (32-bit)
unmaskirq = 1 (on)
using_dma = 1 (on)
keepsettings = 0 (off)
readonly = 0 (off)
readahead = 8 (on)
geometry = 2434/255/63, sectors = 3694887, start = 35407323

sindre · Guru Joined: 01 Nov 2002 Posts: 315 Location: Norway

I have no problems with 2.6, remember to compile for your chipset.

Mr. Hahn · Apprentice Joined: 05 Apr 2003 Posts: 250

hdparm -tT /dev/sda

/dev/sda:
Timing buffer-cache reads: 128 MB in 0.30 seconds =426.67 MB/sec
Timing buffered disk reads: 64 MB in 0.91 seconds = 70.33 MB/sec

My disk read is great but my cache isn't as high as some of you. Could this be because hdparm is mainly for ide disks, or because I have my write caching off? How would I turn it on> (don't say hdparm -W because that is only for ide disks).

Ian · Posted: Thu Jul 31, 2003 3:04 am Post subject:

madchaz · Posted: Thu Jul 31, 2003 3:08 am Post subject:

anyone as a nice doc to get on how to configure it to get best performance?

Right now I have some performance probs and I'm suspecting it's because I didn't configure this.
_________________
Someone asked me once if I suffered from mental illness. I told him I enjoyed every second of it.
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Qweasda · Apprentice Joined: 04 Feb 2003 Posts: 152

I'd like a good configure howto as well...here' my VERY bad results!:

# hdparm -tT /dev/hda

/dev/hda:
Timing buffer-cache reads: 696 MB in 2.00 seconds = 348.00 MB/sec
Timing buffered disk reads: 8 MB in 3.37 seconds = 2.37 MB/sec

# hdparm /dev/hda

/dev/hda:
multcount = 16 (on)
IO_support = 0 (default 16-bit)
unmaskirq = 0 (off)
using_dma = 0 (off)
keepsettings = 0 (off)
readonly = 0 (off)
readahead = 8 (on)
geometry = 4865/255/63, sectors = 78165360, start = 0

I see some of you with readahead 256 and stuff, looks like I need to configure this

TerminalAddict · Tux's lil' helper Joined: 13 Feb 2003 Posts: 119

Qweasda · Apprentice Joined: 04 Feb 2003 Posts: 152

That's my problem, only I have an ECS K7AMA.
When the kernel is loading at boot it says "DMA disabled (bios)" but I see nothing in bios!