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Ginta
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Joined: 17 Feb 2006
Posts: 153
Location: Spain
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 Posted: Fri Apr 21, 2006 2:55 am Post subject: Disk transfers too slow |
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I have two hard disks, one is 160 GB Seagate IDE (hda), and another is 300 GB SATA Seagate (sda), and when I run hdparm (and when I do any disk transfer) I have a slow transfer (comparing with other OSes) (with DMA active).
This is hdparm info:
| Code: |
/dev/hda:
multcount = 16 (on)
IO_support = 1 (32-bit)
unmaskirq = 1 (on)
using_dma = 1 (on)
keepsettings = 0 (off)
readonly = 0 (off)
readahead = 256 (on)
geometry = 19457/255/63, sectors = 312581808, start = 0
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| Code: |
/dev/sda:
IO_support = 0 (default 16-bit)
readonly = 0 (off)
readahead = 256 (on)
geometry = 36481/255/63, sectors = 586072368, start = 0
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Speed tests are:
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/dev/hda:
Timing cached reads: 2720 MB in 2.00 seconds = 1357.20 MB/sec
Timing buffered disk reads: 136 MB in 3.02 seconds = 45.03 MB/sec
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| Code: |
/dev/sda:
Timing cached reads: 2588 MB in 2.00 seconds = 1293.92 MB/sec
Timing buffered disk reads: 180 MB in 3.00 seconds = 59.92 MB/sec
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Can someone tell me why is this so slow? And, if possible, tell me his values of hdparm -Tt ?
Thank you!
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brims
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Location: Arizona
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JeliJami
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Joined: 17 Jan 2006
Posts: 1086
Location: Belgium
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| Posted: Fri Apr 21, 2006 7:37 am Post subject: |
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that seems OK, or at least comparable to mine:
| Code: | # hdparm -tT /dev/sda
/dev/sda:
Timing cached reads: 2596 MB in 2.00 seconds = 1295.61 MB/sec
Timing buffered disk reads: 186 MB in 3.01 seconds = 61.72 MB/sec
# hdparm -tT /dev/hda
/dev/hda:
Timing cached reads: 2324 MB in 2.00 seconds = 1161.02 MB/sec
Timing buffered disk reads: 84 MB in 3.05 seconds = 27.53 MB/sec |
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Former username: davjel |
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brims
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JeliJami
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Joined: 17 Jan 2006
Posts: 1086
Location: Belgium
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| Posted: Fri Apr 21, 2006 9:42 am Post subject: |
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hi brims,
i just posted my numbers to show Ginta that those hdparm test results of his/her are fine
i agree on your comment
| brims wrote: | | I just don't see how a gigabyte a second is slow |
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Kabuto
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Joined: 01 Aug 2002
Posts: 701
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| Posted: Fri Apr 21, 2006 3:22 pm Post subject: |
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| Looks fine. The top number is speed for the interface. The second is the ~average speed of the drive. In actuallity depeneding on where the data is it could be slightly faster or slower than that number. I have seen some Windows benchmarks that can scan the full platter but don't know of any off hand for Linux. |
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Ginta
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Joined: 17 Feb 2006
Posts: 153
Location: Spain
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| Posted: Fri Apr 21, 2006 5:31 pm Post subject: |
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I wanted to say that if I copy data from one disk to the other, it seems slow comparing with windows for example (I didn't want to compare, but this is what I believed). If this is acceptable I was wrong (I didn't know what is the average in gentoo for hdparm or transfers).
Anyway, thank you all 
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brims
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Joined: 19 Apr 2004
Posts: 492
Location: Arizona
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| Posted: Fri Apr 21, 2006 6:48 pm Post subject: |
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| davjel wrote: | hi brims,
i just posted my numbers to show Ginta that those hdparm test results of his/her are fine
i agree on your comment
| brims wrote: | | I just don't see how a gigabyte a second is slow |
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Don't get me wrong I wasn't disagreeing with you, I saw your numbers being about the same as the original posters and that both were higher than mine, and that the speeds Ginta was getting were by no means slow.
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whoracle
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Joined: 23 Dec 2004
Posts: 33
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| Posted: Fri Apr 21, 2006 8:28 pm Post subject: |
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/dev/hda:
Timing cached reads: 2520 MB in 2.00 seconds = 1259.51 MB/sec
Timing buffered disk reads: 10 MB in 3.23 seconds = 3.10 MB/sec
I believe someone forgot to enable dma last kernelupgrade  |
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SnEptUne
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Joined: 23 Aug 2004
Posts: 656
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| Posted: Sun May 28, 2006 5:13 pm Post subject: |
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I have DMA enabled and here's my timings:
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/dev/hdb:
Timing cached reads: 584 MB in 2.01 seconds = 290.63 MB/sec
Timing buffered disk reads: 16 MB in 3.27 seconds = 4.89 MB/sec
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I would be really happy if I have half the speed of your hard drive >_<
Maybe time to upgrade my harddrive.
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OlegVekhov
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Joined: 09 Jun 2006
Posts: 12
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| Posted: Fri Jun 16, 2006 9:27 am Post subject: |
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So i have DMA 66 hdd succesfully tweaked with hdparm... and timed reads 150 MB, but buffered reads only 2 MB!!
I have some queschions: one is how to enable write caching (after executing hdparm - W1, hdparm -i shows that WC disabled).
second - where to read about linux HDD caching architecture, how to alter read/write buffer and so on...
Thanks |
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SnEptUne
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Joined: 23 Aug 2004
Posts: 656
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| Posted: Sun Jun 18, 2006 1:29 am Post subject: |
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| OlegVekhov wrote: | So i have DMA 66 hdd succesfully tweaked with hdparm... and timed reads 150 MB, but buffered reads only 2 MB!!
I have some queschions: one is how to enable write caching (after executing hdparm - W1, hdparm -i shows that WC disabled).
second - where to read about linux HDD caching architecture, how to alter read/write buffer and so on...
Thanks |
If you don't mind data corruption, you can enable write caching from the kernal configuration.
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Kernel & Hardware
