Re: Couple of quetsions HD perf, mac address...

[Laurent Vivier <Laurent.Vivier-6ktuUTfB/bM@public.gmane.org>]

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Benjamin Budts wrote:
> 
> Hi Laurent,
> 
> Intresting stuff, could you send me your patch and the benchmarks please ?
> I think I might try it out.


patch:

http://permalink.gmane.org/gmane.comp.emulators.qemu/15969

benchmarks:

http://permalink.gmane.org/gmane.comp.emulators.kvm.devel/3373

> thx a lot
> 
> Laurent Vivier wrote:
>> Benjamin Budts wrote:
>> [snip]
>>  
>>> 1* When i run hdparm -t /dev/sda1 I have 80-85Mbit/s read speed on my
>>> guest os (debian etch)
>>>
>>> If I run it ''in'' a virtual machine (using also debian Etch with
>>> 2.6.21.5 kernel) I get : 28-35Mbits...
>>>
>>> I even tried to put the image on a seperate disk to be able to have
>>> more, but I can't get more then 35Mbits out of it...
>>>
>>> How can I up the disk performance without having to replace
>>> everything by SCSI hardware ?
>>>
>>>     
>>
>> You can improve performance by using virtual SCSI disks. I post some
>> benchchmarks with dbench on this list at the end of may (24/05).
>>
>> QEmu (and thus KVM) doesn't support natively SCSI disk for the PC virtual
>> machine. I post a patch the 1st of march on QEmu mailing list to add a
>> "-sda"
>> parameter to use SCSI disk (but my approach was not approved by
>> maintainers).
>> The problem with the virtual SCSI is you cannot boot on it because
>> there is no
>> BIOS to manage it. But you can use it as storage and boot linux using the
>> parameter "-kernel" to load directly the kernel from the host disk.
>>
>> Regards,
>> Laurent
>>   
> 
> 


-- 
------------- Laurent.Vivier-6ktuUTfB/bM@public.gmane.org  --------------
       "Any sufficiently advanced technology is
  indistinguishable from magic." - Arthur C. Clarke


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