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Re: Grub2 EFI: Image loading from USB takes too long
From: |
Vladimir 'φ-coder/phcoder' Serbinenko |
Subject: |
Re: Grub2 EFI: Image loading from USB takes too long |
Date: |
Tue, 26 Apr 2011 12:36:43 +0200 |
User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.15) Gecko/20110402 Iceowl/1.0b2 Icedove/3.1.9 |
On 26.04.2011 05:03, Bean wrote:
> Hi,
>
> It's not decided by fs driver, it's configured by a flag in
> grub_file_open, which is passed to the disk driver. There is only a
> few places where we can expect large file, such as linux/initrd
> command.
Yet worse, such a high level shouldn't care about low-level at all.
> And in this case, caching is useless since we only use the
> data once and caching would only flush out useful data unnecessarily.
> By setting a flag to indicate direct read is required, we can optimize
> access for such situation while keeping the cache for others. This is
> similar to the pass through flag for linux/windows.
I don't think that the intent is the same. Under OS considerations are
more along transaction-safeness and barriers for databases and cache
disabling for system software. Normal application shouldn't use those flags.
>> Which is an example of bad design. Rather than improving the existing
>> function to do both caching and unbroken read (like in my 4096 branch)
>> you have 2 functions and force upper layers to do the tradeoffs and care
>> about matters which should be abstracted and invisible to them.
> _______________________________________________
> Grub-devel mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/grub-devel
>
--
Regards
Vladimir 'φ-coder/phcoder' Serbinenko
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- Re: Grub2 EFI: Image loading from USB takes too long, (continued)
- Re: Grub2 EFI: Image loading from USB takes too long, Aravind Srinivasan, 2011/04/06
- Re: Grub2 EFI: Image loading from USB takes too long, KESHAV P.R., 2011/04/07
- Re: Grub2 EFI: Image loading from USB takes too long, Vladimir 'φ-coder/phcoder' Serbinenko, 2011/04/08
- Re: Grub2 EFI: Image loading from USB takes too long, Bean, 2011/04/25
- Re: Grub2 EFI: Image loading from USB takes too long, Vladimir 'φ-coder/phcoder' Serbinenko, 2011/04/25
- Re: Grub2 EFI: Image loading from USB takes too long, Bean, 2011/04/25
- Re: Grub2 EFI: Image loading from USB takes too long,
Vladimir 'φ-coder/phcoder' Serbinenko <=
Re: Grub2 EFI: Image loading from USB takes too long, Finnbarr P. Murphy, 2011/04/16