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karlika
n00b
Joined: 13 Jan 2005
Posts: 8
Location: Graz/Austria
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 Posted: Thu Aug 28, 2008 8:54 pm Post subject: ahci performance problems [solved] |
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Hi,
I just installed gentoo on my brand new FSC Xi2528.
I did everything as always, following the quick install guide. (Minimal install disk 2008.0 r1; Kernel 2.6.25 r7)
After rebooting I notice that the boot process is incredibly slow, reminding me somehow of the old days with my P2 400MHz...
revealed the possible problem:
| Code: | | Timing buffered disk reads: 8 MB in 3.24 seconds = 2.47 MB/sec |
Well, using the install CD I get something like 60MB/sec, so whats wrong?
Any ideas?
Chipset is Intel 82801H (ICH8)
Relevant parts of the .config look like this:
| Code: |
CONFIG_BLK_DEV_IDEDISK=y
CONFIG_IDEDISK_MULTI_MODE=y
CONFIG_BLK_DEV_IDECD=y
CONFIG_BLK_DEV_IDECD_VERBOSE_ERRORS=y
CONFIG_BLK_DEV_IDEACPI=y
CONFIG_IDE_PROC_FS=y
CONFIG_IDE_GENERIC=y
CONFIG_BLK_DEV_IDEDMA_SFF=y
CONFIG_BLK_DEV_IDEPCI=y
CONFIG_IDEPCI_PCIBUS_ORDER=y
CONFIG_BLK_DEV_IDEDMA_PCI=y
CONFIG_BLK_DEV_PIIX=y
CONFIG_SCSI=y
CONFIG_SCSI_DMA=y
CONFIG_SATA_AHCI=y
CONFIG_ATA_PIIX=y
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Not wanting to spam the forum with config files nobody is wantig/able to read, but always willing to give more information on demand. 
Thanks in advance for any suggestions,
Marko
Last edited by karlika on Fri Aug 29, 2008 8:29 am; edited 1 time in total |
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NeddySeagoon
Administrator
Joined: 05 Jul 2003
Posts: 54830
Location: 56N 3W
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| Posted: Thu Aug 28, 2008 10:33 pm Post subject: |
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karlika,
You need to set up your kernellike this
For some reason, you don't have DMA active.
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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karlika
n00b
Joined: 13 Jan 2005
Posts: 8
Location: Graz/Austria
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| Posted: Fri Aug 29, 2008 8:28 am Post subject: [solved] turns out ACPI is the culprit |
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Following a notion I disabled ACPI and voila: read speeds are back at 60 MB/sec.
I'm gonna go build some more kernels to find out the option that caused all of this.
@Neddy:
Thanks for your answer, but there is plenty of DMA
Sorry for not posting any hdparm -I info.
Thanks, bye,
Marko |
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