setting etags - performance

How about setting this in httpd.conf?
####ETags
FileETag None

Good or not for performance?
Thanks a lot!

I doubt

Pagetest - where web sites go to get FAST! says that I have to do something (etags are set the wrong way).
And I saw some htaccess-Files with the above passage.
So, if not leave them away ... how to correct them?

Thanks!

I forgot the second passage

####Turn ETags Off
<ifmodule mod_headers.c>
Header unset ETag
</ifmodule>

Yes, with these two passages I get everything okay in webpagetest.org (etags)

That has nothing to do with server performance and actually that test is useless in many ways imo. I wouldn't worry specific that test , you should check your page loading stats with Google Tools.

I use three tools now:
- firebug/page speed
- yslow
- webpagetest.org

Which are yours?
And why webpagetest.org is useless in your eyes?