Re: kvm-27 vs 28 I/O speed

[Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

Dave Hansen wrote:
> On Thu, 2007-07-12 at 08:37 +0300, Avi Kivity wrote:
>   
>> Can you confirm it by backing out that one patch?
>>     
>
> Do you know the git commit id by chance?
>
> -- Dave
>
>   
commit 55a3212bc2f5ecddcd4c5cdf2bfb37ad71e45ff2
Author: Luca Tettamanti <kronos.it-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date:   Tue Jun 5 14:47:33 2007 +0300

    kvm: qemu: initialize ata ports as enabled

    this allows libata to see the qemu ata ports.

diff --git a/qemu/hw/ide.c b/qemu/hw/ide.c
index 190f074..ddfb9bc 100644
--- a/qemu/hw/ide.c
+++ b/qemu/hw/ide.c
@@ -2586,6 +2586,8 @@ static void piix3_reset(PCIIDEState *d)
     pci_conf[0x06] = 0x80; /* FBC */
     pci_conf[0x07] = 0x02; // PCI_status_devsel_medium
     pci_conf[0x20] = 0x01; /* BMIBA: 20-23h */
+    pci_conf[0x41] = 0x80; // enable port 0
+    pci_conf[0x43] = 0x80; // enable port 1
 }

 void pci_piix_ide_init(PCIBus *bus, BlockDriverState **hd_table, int devfn)


I was unable to reproduce this on a FC6 i386 guest.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.


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