Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
I will check the chipset and compile a new kernel like Lars told.
Hdparm version is 5.5.
the mainboard of nodes is a Asus P4R800-VM, ATI chipset.
Thanks for while.
Marlon
Helmut Wollmersdorfer escreveu:
> Lars Ellenberg schrieb:
>
>> / 2004-07-06 20:58:20 -0300
>> \ Marlon Cabrera Oliveira:
>
>
>>> using_dma = 0 (off)
>>
> [...]
>
>>> /dev/hda:
>>> Timing buffer-cache reads: 2048 MB in 2.00 seconds = 1024.00 MB/sec
>>> Timing buffered disk reads: 14 MB in 3.09 seconds = 4.53 MB/sec
>>
>
>>> I setup dma only for disks on kernel.
>>
>
>> and obviously it is not enabled nevertheless.
>> maybe your chipset is blacklisted because known
>
>
> I use some - known as buggy - VIA chipsets in 4 of my boxes and have
> no problems with Kernel 2.4.22 or 2.4.24.
>
>> check wether your chipset is properly supported.
>
>
> Maybe Marlon should check the base config of DMA first.
>
> # hdparm -d 1 /dev/hda
> # hdparm -tT /dev/hda
>
> Now "Timing buffered disk reads" of an Samsung should be around 50
> MB/sec.
> If not, check chipset, hardware, cables, kernel etc.
> If it is, /etc/default/hdparm should be edited to have an entry like
>
> /dev/hda {
> dma = on
> }
>
> to make DMA permanent.
>
> Then reboot and do hdparm -tT again.
> If the speed again is slow now, hdparm should be updated to the newest
> version. This was my problem, getting DMA permanent for hda, but not
> permanent for hdb, hdc etc. Since upgrade to
>
> helmut at xp2400:~$ hdparm -V
> hdparm v5.4
>
> no problems anymore.
>
> Helmut Wollmersdorfer
>
>
> _______________________________________________
> drbd-user mailing list
> drbd-user at lists.linbit.com
> http://lists.linbit.com/mailman/listinfo/drbd-user
>
>