Re: Disk I/O stalling whole system ..

[Mariano Kamp <mkamp@gmx.de>]

On Tuesday 09 September 2003 03:16, Shyamal Prasad wrote:
>     "Mariano" == Mariano Kamp <mkamp@gmx.de> writes:
>
>     Mariano> Hi, when copying from one ide disk to another ide disk on
>     Mariano> the the same controller the whole systems stalls. I am
>     Mariano> running 2.4.19 on unstable.

> Do you have DMA enabled on your HD?

> hdparm /dev/hd?
Shyamal,

  I am running reiserfs - don't know if that is of importance. DMA is enabled 
on both disks.  You can see the output of hdparm below. Anything else I can 
watch out for?

Cheers,
Mariano

black:/home/mkamp/.kde# df -kh
Filesystem            Size  Used Avail Use% Mounted on
/dev/hda3              74G   66G  8.0G  90% /
/dev/hda1             7.6M  3.7M  3.6M  52% /boot
/dev/hdb1              56G   40G   17G  71% /x2
black:/home/mkamp/.kde# hdparm -t /dev/hda

/dev/hda:
 Timing buffered disk reads:  104 MB in  3.04 seconds =  34.21 MB/sec
black:/home/mkamp/.kde# hdparm -t /dev/hdb

/dev/hdb:
 Timing buffered disk reads:  106 MB in  3.05 seconds =  34.75 MB/sec
black:/home/mkamp/.kde# hdparm /dev/hda

/dev/hda:
 multcount    = 16 (on)
 IO_support   =  1 (32-bit)
 unmaskirq    =  1 (on)
 using_dma    =  1 (on)
 keepsettings =  0 (off)
 readonly     =  0 (off)
 readahead    =  8 (on)
 geometry     = 9729/255/63, sectors = 156301488, start = 0
black:/home/mkamp/.kde# hdparm /dev/hdb

/dev/hdb:
 multcount    = 16 (on)
 IO_support   =  1 (32-bit)
 unmaskirq    =  1 (on)
 using_dma    =  1 (on)
 keepsettings =  0 (off)
 readonly     =  0 (off)
 readahead    =  8 (on)
 geometry     = 7297/255/63, sectors = 117231408, start = 0