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lo-jay
l33t
Joined: 27 Feb 2005
Posts: 862
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 Posted: Tue Feb 28, 2006 1:24 am Post subject: raptor kinda slow? |
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rebuild my box with a 74gb raptor ( = sda) as system drive & a 200gb maxtor ( = sdb ) for /home.
the hdparm readings don't show a lot of difference though?
| Code: | /dev/sda:
Timing cached reads: 3636 MB in 2.00 seconds = 1817.89 MB/sec
Timing buffered disk reads: 196 MB in 3.02 seconds = 64.90 MB/sec
/dev/sdb:
Timing cached reads: 3628 MB in 2.00 seconds = 1813.89 MB/sec
Timing buffered disk reads: 172 MB in 3.01 seconds = 57.18 MB/sec |
using reiserfs as filesystem.
thanks again!
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lo-jay
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albright
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Joined: 16 Nov 2003
Posts: 2588
Location: Near Toronto
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| Posted: Tue Feb 28, 2006 1:47 am Post subject: |
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Mine are about the same for 74gb raptor:
| Code: | Timing cached reads: 2696 MB in 2.00 seconds = 1346.86 MB/sec
Timing buffered disk reads: 206 MB in 3.02 seconds = 68.13 MB/sec |
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codergeek42
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Joined: 05 Apr 2004
Posts: 5142
Location: Anaheim, CA (USA)
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| Posted: Tue Feb 28, 2006 2:28 am Post subject: |
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I get about the same with my 74 GB Raptor as well: | Quote: | /dev/sda:
Timing cached reads: 2644 MB in 2.00 seconds = 1321.92 MB/sec
Timing buffered disk reads: 206 MB in 3.02 seconds = 68.12 MB/sec |
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truekaiser
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Joined: 05 Mar 2004
Posts: 810
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| Posted: Tue Feb 28, 2006 4:23 am Post subject: |
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thats slow??
it's alot faster then my 300gb ide drive.. |
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codergeek42
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Joined: 05 Apr 2004
Posts: 5142
Location: Anaheim, CA (USA)
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| Posted: Tue Feb 28, 2006 6:11 am Post subject: |
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| truekaiser wrote: | thats slow??
it's alot faster then my 300gb ide drive.. |
It's also about 10-15 MB/s faster than my Maxtor PATA drive (120GB; both are running at UDMA/133 speeds and have 8 megs cache...)
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Jake
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Joined: 31 Jul 2003
Posts: 1132
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| Posted: Tue Feb 28, 2006 6:22 am Post subject: |
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| Isn't the Raptor's performance advantage supposed to be reduced latency more than increased throughput? |
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codergeek42
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Joined: 05 Apr 2004
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Location: Anaheim, CA (USA)
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| Posted: Tue Feb 28, 2006 6:32 am Post subject: |
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| Jake wrote: | | Isn't the Raptor's performance advantage supposed to be reduced latency more than increased throughput? |
Exactly. However, this reduce seek latency allows for slightly higher throughputs as well (especially with the newer Raptor models and SATA controllers which allow for things like command queueing and the like). 
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Jake
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Joined: 31 Jul 2003
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| Posted: Tue Feb 28, 2006 6:45 am Post subject: |
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| codergeek42 wrote: | | Exactly. However, this reduce seek latency allows for slightly higher throughputs as well (especially with the newer Raptor models and SATA controllers which allow for things like command queueing and the like). |
True, but I think lo-jay should do some real benchmarks (on clean filesystems so reiserfs fragmentation isn't a factor) and not trust hdparm. |
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