Re: drastically low perform. - quad, 4G ram, 2.4.20

From: J.A. Magallon (jamagallon@able.es)
Date: Wed Mar 12 2003 - 17:35:16 EST

On 03.12, Mailing Lists wrote:
>
> ok, so here's my comparison tests per Martin's earlier post. (if anyone
> has suggestions on comparison tests i SHOULD be doing or things i should
> be checking, let me know).
>
>
> mem=3072M BOOT
>
> * hdparm -t /dev/sda
>
> /dev/sda:
> Timing buffered disk reads: 64 MB in 3.78 seconds = 16.93 MB/sec
>
>
> * hdparm -t /dev/sdb
>
> /dev/sdb:
> Timing buffered disk reads: 64 MB in 2.75 seconds = 23.27 MB/sec
>
>

Don't know about the rest, but this SCSI performance looks pretty low:

annwn:~# hdparm -tT /dev/sda

/dev/sda:
 Timing buffer-cache reads: 128 MB in 0.24 seconds =533.33 MB/sec
 Timing buffered disk reads: 64 MB in 1.56 seconds = 41.03 MB/sec

Relevant parts of dmesg:

SCSI subsystem driver Revision: 1.00
PCI: Setting latency timer of device 03:02.0 to 64
scsi0 : Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev 6.2.29
        <Adaptec 29160 Ultra160 SCSI adapter>
        aic7892: Ultra160 Wide Channel A, SCSI Id=7, 32/253 SCBs

blk: queue f7e77a18, I/O limit 4095Mb (mask 0xffffffff)
(scsi0:A:0): 160.000MB/s transfers (80.000MHz DT, offset 127, 16bit)
(scsi0:A:1): 160.000MB/s transfers (80.000MHz DT, offset 127, 16bit)
(scsi0:A:2): 10.000MB/s transfers (10.000MHz, offset 16)
  Vendor: FUJITSU Model: MAJ3364MP Rev: 0115
  Type: Direct-Access ANSI SCSI revision: 04
blk: queue f7e77818, I/O limit 4095Mb (mask 0xffffffff)
  Vendor: FUJITSU Model: MAJ3364MP Rev: 0115
  Type: Direct-Access ANSI SCSI revision: 04
blk: queue f7e77618, I/O limit 4095Mb (mask 0xffffffff)
  Vendor: TOSHIBA Model: CD-ROM XM-6201TA Rev: 1030
  Type: CD-ROM ANSI SCSI revision: 02
blk: queue f7e77418, I/O limit 4095Mb (mask 0xffffffff)
  Vendor: IOMEGA Model: ZIP 100 Rev: E.08
  Type: Direct-Access ANSI SCSI revision: 02 

-- 
J.A. Magallon <jamagallon@able.es>      \                 Software is like sex:
werewolf.able.es                         \           It's better when it's free
Mandrake Linux release 9.1 (Cooker) for i586
Linux 2.4.21-pre5-jam0 (gcc 3.2.2 (Mandrake Linux 9.1 3.2.2-3mdk))
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This archive was generated by hypermail 2b29 : Sat Mar 15 2003 - 22:00:33 EST