[linux-elitists] tuna wiggle

Eugen Leitl eugen@leitl.org
Wed Jan 7 15:34:39 PST 2004

Is there anything particular in below invocation

/sbin/hdparm -u1 -c3 -d1 -m16 -A1 -X69 -M254 /dev/hda

which will make it hang the machine, at times, when called from /etc/rc.d/rc.local
but not from an interactive shell?

The improvement in performance is quite dramatic. The hardware is pretty

[root@hydrogen eugen]# /sbin/hdparm -tT /dev/hda

 Timing buffer-cache reads:   800 MB in  2.01 seconds = 398.80 MB/sec
 Timing buffered disk reads:  114 MB in  3.01 seconds =  37.86 MB/sec

recent, and it doesn't seem to matter if I relax some of the above

[...from dmesg output...]
Uniform Multi-Platform E-IDE driver Revision: 7.00beta4-2.4
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
SIS5513: IDE controller at PCI slot 00:02.5
SIS5513: chipset revision 208
SIS5513: not 100% native mode: will probe irqs later
SIS5513: SiS735 ATA 100 (2nd gen) controller
    ide0: BM-DMA at 0xff00-0xff07, BIOS settings: hda:DMA, hdb:DMA
    ide1: BM-DMA at 0xff08-0xff0f, BIOS settings: hdc:DMA, hdd:DMA
hda: SAMSUNG SV1204H, ATA DISK drive
blk: queue c0388860, I/O limit 4095Mb (mask 0xffffffff)
hdc: AOpen Inc. DVD-ROM DVD-1640 PRO 0122, ATAPI CD/DVD-ROM drive
ide2: ports already in use, skipping probe
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide1 at 0x170-0x177,0x376 on irq 15
hda: attached ide-disk driver.
hda: host protected area => 1
hda: 234493056 sectors (120060 MB) w/2048KiB Cache, CHS=14596/255/63,
Partition check:
 hda: hda1 hda2 < hda5 hda6 hda7 hda8 >
ide: late registration of driver.


parameters (omit -X, -M, e.g.).

Any ideas?

-- Eugen* Leitl <a href="http://leitl.org">leitl</a>
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