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SubjectRe: DMA blues...System lockup on setting DMA mode using hdparam
On Fri, 23 Feb 2001, Jasmeet Sidhu wrote:

> Also another question related to IDE:
> Is there anyway we can see how good/bad the system performance is while
> the system is working?

that information (what the disk subsytem as a whole is doing) is collected
in /proc/stat something like xosview can help you visualize it.

> I am not talking about a benchmarking tool like
> bonnie that simply tries to figure out how good a system can perform. I
> would like to see something, maybe in /proc/ide/, that shows me the current
> throughput of the ide subsystem. For example how many kb of data is going
> in, how much coming out of each device. Any ideas on how to go about maybe
> adding this? Where would be an ideal place to add such functionality? In
> the ide code or maybe in the raid section? Or maybe these two should be
> kept separate. Any thoughts guys?
>
> Any additional required information can be posted, let me know.
>
> Anybody else out there with a similar situation? Your thoughts on this
> would be really appreciated.

I actually have a similar situation although without hanging, with three
controllers. the kernels detects the two devices on the third controller
as udma rather than udma(100) with 2.4.1.

hda: 30003120 sectors (15362 MB) w/1916KiB Cache, CHS=1867/255/63, UDMA(33)
hdc: 30003120 sectors (15362 MB) w/1916KiB Cache, CHS=29765/16/63, UDMA(33)
first two are on the server-works chipset controller

hde: 150136560 sectors (76870 MB) w/1916KiB Cache, CHS=148945/16/63, UDMA(100)
hdg: 150136560 sectors (76870 MB) w/1916KiB Cache, CHS=148945/16/63, UDMA(100)
hdi: 150136560 sectors (76870 MB) w/1916KiB Cache, CHS=148945/16/63, UDMA(100)
hdk: 150136560 sectors (76870 MB) w/1916KiB Cache, CHS=148945/16/63, UDMA(100)
hdm: 30003120 sectors (15362 MB) w/1916KiB Cache, CHS=29765/16/63, (U)DMA
hdo: 150136560 sectors (76870 MB) w/1916KiB Cache, CHS=148945/16/63, (U)DMA
these 6 are on three promise contollers... all with 18" 80pin cable

hdd: ATAPI 40X CD-ROM drive, 128kB Cache, UDMA(33)


> Here's the setup:
>
> ide0 at 0x3800-0x3807,0x3402 on irq 11 PDC20265
> ide1 at 0x3000-0x3007,0x2802 on irq 11
> ide2 at 0x5400-0x5407,0x5002 on irq 15 PDC20267
> ide3 at 0x4800-0x4807,0x4402 on irq 15
> ide4 at 0x7000-0x7007,0x6802 on irq 11 PDC20267
> ide5 at 0x6400-0x6407,0x6002 on irq 11
> ide6 at 0x8800-0x8807,0x8402 on irq 14 PDC20267
> ide7 at 0x8000-0x8007,0x7802 on irq 14
> ide8 at 0xa400-0xa407,0xa002 on irq 10 PDC20267
> ide9 at 0x9800-0x9807,0x9402 on irq 10
>
> hda: 40188960 sectors (20577 MB) w/1916KiB Cache, CHS=39870/16/63, UDMA(100)
> hdc: 150136560 sectors (76870 MB) w/1916KiB Cache, CHS=148945/16/63, UDMA(100)
> hde: 150136560 sectors (76870 MB) w/1916KiB Cache, CHS=148945/16/63, UDMA(100)
> hdg: 150136560 sectors (76870 MB) w/1916KiB Cache, CHS=148945/16/63, UDMA(100)
> hdi: 150136560 sectors (76870 MB) w/1916KiB Cache, CHS=148945/16/63, UDMA(100)
> hdk: 150136560 sectors (76870 MB) w/1916KiB Cache, CHS=148945/16/63, UDMA(100)
> hdm: 150136560 sectors (76870 MB) w/1916KiB Cache, CHS=148945/16/63, UDMA(100)
> hdo: 150136560 sectors (76870 MB) w/1916KiB Cache, CHS=148945/16/63, UDMA(100)
> hdq: 150136560 sectors (76870 MB) w/1916KiB Cache, CHS=148945/16/63, UDMA(100)
> hds: 150136560 sectors (76870 MB) w/1916KiB Cache, CHS=148945/16/63, UDMA(100)
>
> # Raid-5 configuration
> #
> raiddev /dev/md0
> raid-level 5
> chunk-size 4
> parity-algorithm left-symmetric
> persistent-superblock 1
> nr-raid-disks 8
> nr-spare-disks 1
> device /dev/hde1
> raid-disk 0
> device /dev/hdg1
> raid-disk 1
> device /dev/hdi1
> raid-disk 2
> device /dev/hdk1
> raid-disk 3
> device /dev/hdm1
> raid-disk 4
> device /dev/hdo1
> raid-disk 5
> device /dev/hdq1
> raid-disk 6
> device /dev/hds1
> raid-disk 7
> device /dev/hdc1
> spare-disk 0
>
> [root@bertha hdparm-3.9]# df -k
> Filesystem 1k-blocks Used Available Use% Mounted on
> /dev/hda3 19072868 3589612 14514392 20% /
> /dev/hda1 198313 11667 176392 7% /boot
> /dev/md0 525461076 108657156 416803920 21% /raid
> sj-f760-1:/vol/vol03/data01
> 142993408 140675648 2317760 99% /mnt/netapps
>
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arms. Karl Marx -- Introduction to the critique of Hegel's Philosophy of
the right, 1843.


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