[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-users] Very slow drives, I/O - DMA issues?

>>> On 2/21/07, Lonny Selinger <lonny@xxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>>>> >> Thanks again Jerry, I had tried both of those previously and found
>>>> nothing
>>>> >> related to the nforce chipset:
>>> How about
>>> grep NFORCE2 /boot/config*
>> I found the only references to NFORCE in:
>> /boot/config-2.6.9-42.0.8.EL:CONFIG_I2C_NFORCE2=m
>> /boot/config-2.6.9-42.EL:CONFIG_I2C_NFORCE2=m
>> Mind you I toasted my Xen kernel and am building one from scratch,
>> removing
>> the clean kernel build from the make. I think the driver is actually
>> amd74xx
>> so I tried building it into the kernel but then when I try to create the
>> ramdisk image it errors asying that that module doesn't exist .... Soooo
>> I'm
>> going to try to build the module and preload it when I create the initrd
>> ...
>> and then try to boot it remotely so if it dies I wont be able to fix it
>> until
>> later lol
>> I'll keep posting any progress.
>> --
>> Lonny
> If you build the module into the kernel then it does not have to be
> present in the initrd RAM disk.

True ... which is why I couldn't figure out why the ramdisk wouldn't build ...
it kept erroring out looking for a module that wasn't there. Here's the scoop
... everything is working now :D

I rebuild a custom xen kernel ... basically I think for nothing (other than it
was a newer version then what I had with the src.rpms) The key was the preload
for the ide module required for my drives. After a VERY long brain fart I
actually checked the driver I was using for my IDE devices in proc:

Non Xen Kernel:
# ls /proc/ide
amd74xx  drivers  hda  hdb  hdc  hdd  ide0  ide1

and now WITH Xen Kernel
# ls /proc/ide
amd74xx  drivers  hda  hdb  hdc  hdd  ide0  ide1

after doing an hdparm:

# for i in hda hdb; do
> hdparm -tT /dev/$i;
> done

 Timing cached reads:   1380 MB in  2.00 seconds = 689.47 MB/sec
 Timing buffered disk reads:  142 MB in  3.02 seconds =  47.02 MB/sec

 Timing cached reads:   1452 MB in  2.00 seconds = 725.20 MB/sec
 Timing buffered disk reads:  138 MB in  3.02 seconds =  45.68 MB/sec

Everything is MUCH happier. THanks everyone for your help!!


"The glass is neither half empty nor half full ... it is twice as big as it
needs to be"

Xen-users mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.