Subject: Re: Re: Windows performance / threading file access

From: Karsten Blees <[email-masked]>
Date: Tue, 22 Oct 2013 17:40:08 +0200

Am 22.10.2013 16:49, schrieb Sebastian Schuberth:
> On Tue, Oct 22, 2013 at 4:30 PM, Karsten Blees <[email-masked]> wrote:
> 
>>>> Could you post details about your test setup? Are you still using
>>>> WebKit for your tests?
>>> I'm on Win7 x64, Core i5 M560, WD 7200 Laptop HDD, NTSF, no virus
>>> scanner, truecrypt, no defragger.
>>>
>>
>> OK, so truecrypt and luafv may screw things up for you (according to my measurements, luafv roughly doubles lstat times on C:).
> 
> Aren't we disabling UAC / LUAFV on a per-executable basis using
> manifests? At least the blog article at [1] suggests that we are in
> fact doing it the right way using our script to genera the manifests
> [2].
> 
> Oh but wait, we're not generating a manifest for git.exe itself, only
> for executables that contain "setup", "install", "update", "patch"
> etc. So maybe having a manifest for git.exe, too, would improve
> performance?
> 

Even with UAC disabled in control panel, the luafv.sys driver slows things down on C: (no impact on non-system drives). Procmon shows that with disabled luafv, GetFileAttributesEx is a single FASTIO call. With luafv running, FASTIO fails and is followed by three IRP calls (open, query, close).

I haven't tried with UAC enabled, or if disabling virtualization for git.exe has an impact.

Karsten

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