Re: Load speed test?

[David Balažic]

Not sure, but I did some testing.
I booted the mentioned RIPLinux 13.5* using the same hardware, but
different boot loaders.
The results are:
 - grub2 on fat32 : 7 seconds for kernel, 185 s for initrd
 - grub4dos / NTFS : 2 + 27 seconds
 - syslinux : 1 + 27 seconds
 - LILO : 29+1 seconds

I get similar results on a second PC.


* - I did I slight modification, by recompressing the roofs.cgz with
XZ compression. Otherwise it wouldn't boot from an USB stick.
I would hang during initrd decompression.


Regards,
David

On 5 December 2011 13:08, Nikolay Kichukov <address@hidden> wrote:
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> Hello David,
> perhaps this has something to do with the compact directive of LILO. I am not 
> sure how that option is called in grub
> though. Enabling compact does:
>
> "              Tries  to  merge  read  requests for adjacent sectors into a 
> single read request. This drastically
> reduces load time and keeps the map file smaller. Using `compact' is 
> especially recommended when booting using a map
> file on a floppy disk."
>
> When booting from USB drive and not having compact enabled in LILO I have 
> experienced the same effect.
>
> Hope that might give you some hints in the right direction.
>
> Cheers,
> - -Nik
>
> On 12/04/2011 10:58 PM, David Balažic wrote:
>>>  I am debugging some slow loading from an USB key and don't know where to 
>>> start.
>>>
>>>  I am loading RIPLinux 13.5 from a USB key of 16GB, that has a loading
>>>  speed of almost 30 MB/s in a loaded OS (Linux or Windows).
>>>
>>>  The booting takes minutes, while on other (slower) USB keys (using
>>>  grub legacy) it is less than 30 seconds.
>>
>> I replaced the boot loader with GRUB4DOS 0.4.4 and it is much faster loading 
>> the same
>> files (riplinux 13.5).
>>
>> It is a factor 5-6 difference. I tested on multiple PCs.
>> Any idea why grub2 is so slow in loading?
>>
>> Regards,
>> David
>>
>>
>> _______________________________________________
>> Help-grub mailing list
>> address@hidden
>> https://lists.gnu.org/mailman/listinfo/help-grub
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