Hi there,
Am Donnerstag, 6. M�rz 2003 20:48 schrieb Alan:
> On Thu, Mar 06, 2003 at 02:41:20PM -0500, Ernie Schroder wrote:
> > I'm getting ready to take Gentoo_2 off line and replace mobo and
> > processor I was looking at hdd's this morning and saw Western Digital
> > 80 and 120 gig udma 133 drives at both the same pricethe difference is
> > that the 80 gig has 8 megs of cache and the 120 2gigs.both claim a seek
>
> ^^^^^ Gigs???
>
> > time of 9.1ms. could some one voice an opinion here.(as if I have to
> > look far on this list for an opinion :) ) Which would you buy?
>
> More cache is always better performance, but if it means you can get the
> extra 40G.... Kinda hard to say. I got myself some of the WD 80G/8m
> drives a couple of months ago and have been quite happy. There was a
> bigger price difference between the 80 and 120 at that point though :)
>
> Tough decision, I guess it really comes down to space or performance.
> Granted, I can't give you quantitative evidence of the performance of
> the 8m vs 2m cache.
I have the WD 80G drive with 2MB Cache, so I will just post my values.
>
> My hdparm results:
>
> phoenix alan # hdparm /dev/hdf
>
> /dev/hdf:
> multcount = 16 (on)
> IO_support = 0 (default 16-bit)
> unmaskirq = 0 (off)
> using_dma = 1 (on)
> keepsettings = 0 (off)
> readonly = 0 (off)
> readahead = 8 (on)
> geometry = 155061/16/63, sectors = 156301488, start = 0
/dev/hda:
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 = 9729/255/63, sectors = 156301488, start = 0
> phoenix alan # hdparm -Tt /dev/hdf
> /dev/hdf:
> Timing buffer-cache reads: 128 MB in 0.80 seconds =159.60 MB/sec
> Timing buffered disk reads: 64 MB in 2.07 seconds = 30.86 MB/sec
/dev/hda:
Timing buffer-cache reads: 128 MB in 0.50 seconds =256.00 MB/sec
Timing buffered disk reads: 64 MB in 2.04 seconds = 31.37 MB/sec
Quite strange that my cache reads are much faster, probably it's teh
controller.
> phoenix alan # dmesg | grep hdf
> hdf: WDC WD800JB-00CRA1, ATA DISK drive
> hdf: 156301488 sectors (80026 MB) w/8192KiB Cache, CHS=155061/16/63,
> UDMA(100)
Kernel command line: root=/dev/hda8 hdd=ide-scsi
ide0: BM-DMA at 0xd400-0xd407, BIOS settings: hda:DMA, hdb:DMA
hda: WDC WD800BB-53BSA0, ATA DISK drive
hda: 156301488 sectors (80026 MB) w/2048KiB Cache, CHS=9729/255/63, UDMA(100)
So it seems that in this small "benchmark" the cache doesn't score too much
perhaps there are some better things to run like bonnie or dbench.
Greetings
Christian
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