[root@viper /root]# hdparm -t /dev/sda

/dev/sda:
Timing buffered disk reads: 64 MB in 2.04 seconds = 31.37 MB/sec
[root@viper /root]# hdparm -t /dev/sdb

/dev/sdb:
Timing buffered disk reads: 64 MB in 1.98 seconds = 32.32 MB/sec
[root@viper /root]#

Mine is 2 Seagate 9.1 scsi 160/10K on Adaptec 29160 scsi controller using Redhat 7.0 pro

It looks like I am the winner so far!

[Edited by nabil on 02-16-2001 at 05:05 AM]

If you are wondering why your ATA-66 or ATA-100 Harddrives are not putting up 66MB/s and 100MB/s respectively this would be because the 66MB/s and the 100MB/s are the max burst rates of the bus. There are currently no drives out there that can sustain that speed on ATA and there are not a lot of drives that will even burst at that speed.

I get about 6MB/sec data transfer rate on a WD 10.2 dma/66.I added this to my /etc/rc.d/rc.local:
#disk tweak
hdparm -c3 /dev/hdx

When I tried enableing dma,I got total lockup of system and had to do a hard shutdown and forced check on reboot.There are some issues mentioned in man hdparm about WD hdds and multicount settings.The multicount was already set to 16 in MDK7.1.I would really like to get more out of this hdd but I just threw my hands in the air after lockup and settled for the doubling of my I/O rate after the tweak I did.I've read the man page,the O'Reilly doc,the MUO doc,and looked around WD's site but couldnt find anything there.Maybe if I set multicount to 8 and tried the -d1 setting again?
lynch

With -T option
145.45 MB/s

With -t option
27.83 MB/s

System: Duron 650 on a Asus AV7 board, Promise ATA 100 controler. Maxtor 7200RPM, 15Gig HD

Changing to 32bit IO support doubled my previous results. Thanks for the info.

/dev/hda:
Timing buffered disk reads: 64 MB in 19.54 seconds = 3.28 MB/sec

/dev/hdb:
Timing buffered disk reads: 64 MB in 17.92 seconds = 3.57 MB/sec

/dev/hdc:
Timing buffered disk reads: 64 MB in 27.37 seconds = 2.34 MB/sec

hda is a 20 gig deskstar 7200RPM ATA66 (but not being used to its potential)
hdb is a 12 gig bigfoot
hdc is a 2 gig drive that I threw in as a /var/spool/mail partition

The reason this is so slow is because Im running an old VIA board that only supports up to a P233MMX (which is whats in there) but for running my domain its more than enough!

[root@viper /root]# hdparm -t /dev/md0

/dev/md0:
Timing buffered disk reads: 64 MB in 1.60 seconds = 40.00 MB/sec

Thomas-
i have pretty much the same setup. 650Duron on A7V... how do i get my IBM 75GXP to work on the Promise connectors?
[RH Guiness 7]

Linux box is smoking...

Box is a Gateway P100

/dev/hda:
64 MB in 52.20 seconds = 1.23 MB/sec

/dev/hdb:
64 MB in 28.43 seconds = 2.25 MB/sec

/dev/hde:
64 MB in 10.32 seconds = 6.20 MB/sec

Note: hde doesn't really work. It randomly freezes the box when used.

Drive Info:
RZ1000: IDE controller on PCI bus 00 dev 08
RZ1000: chipset revision 1
RZ1000: not 100% native mode: will probe irqs later
ide0: disabled chipset read-ahead (buggy RZ1000/RZ1001)
ide1: disabled chipset read-ahead (buggy RZ1000/RZ1001)
PDC20267: IDE controller on PCI bus 00 dev 30
PDC20267: chipset revision 2
PDC20267: not 100% native mode: will probe irqs later
PDC20267: ROM enabled at 0xfe000000
PDC20267: (U)DMA Burst Bit ENABLED Primary PCI Mode Secondary PCI Mode.
ide2: BM-DMA at 0xfc80-0xfc87, BIOS settings: hde:DMA, hdf:pio
ide3: BM-DMA at 0xfc88-0xfc8f, BIOS settings: hdg:pio, hdh:pio
hda: Maxtor 71260 AT, ATA DISK drive
hdb: ST34340A, ATA DISK drive
hdd: MATSHITA CR-574, ATAPI CD/DVD-ROM drive
hde: ST310212A, ATA DISK drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide1 at 0x170-0x177,0x376 on irq 15
ide2 at 0xfce0-0xfce7,0xfcda on irq 9
hda: 2467614 sectors (1263 MB) w/256KiB Cache, CHS=612/64/63
hdb: 8404830 sectors (4303 MB), CHS=2084/64/63
hde: 20005650 sectors (10243 MB) w/512KiB Cache, CHS=19846/16/63, UDMA(66)
hdd: ATAPI 4X CD-ROM drive, 211kB Cache

My 486dx2-66 Dell machine runing Smoothwall ver 0.9.5lf gave me:
64 MB in 38.99 seconds = 1.64 MB/se

My 486dx2-66 Dell machine runing Smoothwall ver 0.9.5lf gave me:
64 MB in 38.99 seconds = 1.64 MB/se

havent tried my SuSE70 machine yet...

Here are my scores from doing three "hdparm -Tt /dev/hda"

31.53 MB/sec
32.00 MB/sec
31.84 MB/sec

Note that these were done in single user mode. I think I may be able to increase this number since I don't think I compiled support for my Via chipset into the kernel (since it didn't mention KT133 in the make xconfig description). I may try to make a new kernel later.

My system specs:

Athlon Thunderbird 1100
MSI K7T Pro2-A (KT133 with ATA100 support)
128 MB PC-133 RAM
20 GB Western Digital ATA100 7200 RPM
RedHat 7.0 with kernel 2.4.2

Rimmer

Before I set up my DMA properly, with the -c and -d settings, I was getting:

32 MB in 5.92 seconds = 5.41 MB/s



after changing the DMA and 32 bit to on, I'm getting:

32 MB in 3.40 seconds = 9.41 MB/s



not bad, a free 4 MB/s there. Thanks for the tip! I'm running on an old P166 w/ a Quantum Bigfoot 6.4, I think it's ATA/33, but not sure. The drive's like 3-4 years old.

Tim

I saw a reference, by rimmer, to this post on another board. Here's the setting I use.

hdparm -c1 -d1 -m16 -u1 -W1 /dev/hda

Here's the results from the test

: root; hdparm -Tt /dev/hda

/dev/hda:
Timing buffer-cache reads: 128 MB in 0.72 seconds =177.78 MB/sec
Timing buffered disk reads: 64 MB in 1.79 seconds = 35.75 MB/sec
: root; hdparm -Tt /dev/hda

/dev/hda:
Timing buffer-cache reads: 128 MB in 0.67 seconds =191.04 MB/sec
Timing buffered disk reads: 64 MB in 1.85 seconds = 34.59 MB/sec
: root; hdparm -Tt /dev/hda

/dev/hda:
Timing buffer-cache reads: 128 MB in 0.76 seconds =168.42 MB/sec
Timing buffered disk reads: 64 MB in 1.79 seconds = 35.75 MB/sec
: root;

The buffercache test would have been a bit faster but I was running setiathome.

The motherboard is an asus a7v133 and a 1G athlon overclocked to 1160 (multiplier is 8, fsb is 146MHz)
1/2 Gig memory
via southbridge vt82c686b (UDMA100 controller)
45G ibm 75gxp (7200RPM IDE)

Read the man page, there are lots of warnings concerning a lot of the settings that I'm using. So far so good but read the man page and understand the different opotions before you try. The most important options that I've found are: -c1 -d1 -m16. These appear pretty safe.

Regarding scsi performance, I did some timings on a system at work to compare to the box I just built. It is an adaptec 160 whatever adapter and a seagate 40G, 10K rpm.

hdparm was returning 45Mbytes/sec or so. If anybody has a burning interest in the exact numbers, I can run some tests on monday and post the results.

Regarding the comment that scsi was a work in progress in Linux, I've been able to do benchmarks between Suns and Linux boxes on various platforms since about 1996 and have never seen any particular difference in performance between two comparable hardware.


--john

64M in 6.9secs = 9.22MB/sec

Dell Latitude CPi A400 Labtop
PII Celeron 400MHz
HD 6.4M (made by IBM sorry no more details
SuSe 7.1 with 2.4.0 kernal

I had an idea it was slightly fast but:

64M in 1.82secs =35.16MB/sec

This is my new home made system

IBM Deskstar 75GXP ATA100 30.7GM model DTLA-307030 (not SCSI)
Abit 6BEII rev2 motherboard, BX chipset, HPT370 RAID controller (but NO raid, just one HD drive)
256M PC100 RAM
Intel P3 800MHz slot1 CPU