linux-kernel - Re: [PATCH 1/2] VMware guest detection for x86 and x86-64

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 25 Sep 2008 03:28:08 +0200
From:	Bernd Eckenfels <ecki@...a.inka.de>
To:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] VMware guest detection for x86 and x86-64

In article <20080925002333.GD21049@...tp.cn.ibm.com> you wrote:
> Oh I never heard about this. I've been using several VMware VMs
> (combined RHEL and SLES and Debian) but haven't seen such
> issue. What's the symptom?

Having a high HZ slows down VMs and also leads to tick loss (time drift). HZ
100 or 250 is recommended by most Vendors.

I think some distributions use the reduced HZ value by default anyway, so
you might never had a problem with this.

It is also only a problem with system load and timekeeping, which is not
always obvious. When running a lot of nearly idle VM Guests you might see
it.

Gruss
Bernd
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/