This is the mail archive of the cygwin-developers mailing list for the Cygwin project.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: Cygwin Filesystem Performance degradation 1.7.5 vs 1.7.7, and methods for improving performance

On Oct  7 15:25, Corinna Vinschen wrote:
> On Oct  7 15:17, Yoni Londner wrote:
> > Hi,
> > 
> > Sorry for my prev email (I noticed your 2 emails only after I sent
> > it) and for top posting.
> No worries.
> > > Actually, I can't reproduce it at all.  I just created a patch which
> > > drops the GENERIC_READ and only opens the symlinks with it, just as
> > > proposed.  The results between the two versions are statistically
> > > identical.
> > 
> > I did a little investigation to find out why you can't reproduce it.
> > I found that the cause it is so slow on my computer is NOD32 AV (as
> > all the computers in my company).
> > When i disable it, I got the results you got.
> > 
> > So, I looked for computers with different AV software and found two,
> > one with Symantec, and one with Mcafee.
> > Symantec was even slower:
> >   3592 files stat() 4023ms, per file: 1.1201ms
> > Mcafee more or less was the same:
> >   3592 files stat() 3425ms, per file: 0.9535ms
> > My computer (NOD32):
> >   3592 files stat() 3353ms, per file: 0.9333ms
> So, there's a good reason I hate virus scanners.  I'll check in my
> patch then since it seems to be a good idea for all users which are
> forced to use them.

I'm still wondering, though, why this solution is slower on Samba.
What on earth is Samba's problem with the restricted access mask?!?


Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]