FreeBSD on Amazon AWS EC2 long standing performance problems
seanc at freebsd.org
Fri Feb 5 23:14:35 UTC 2021
To be clear, this is a known issue that needs attention: it is not a
benchmarking setup problem. Network throughput has a similar problem and
needs similar attention. Cloud is not a fringe server workload. -sc
On Fri, Feb 5, 2021 at 3:00 PM Jin Guojun[VFF] <jguojun at gmail.com> wrote:
> On 2021-02-05 12:45, Gunther Schadow wrote:
> > Gordon Bergling wrote:
> >> Can you verify your feelings by numbers?
> > Yes, like I said
> >>> Not by a few % points, but by factors if not an order of magnitude!
> > https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253261
> > Do this:
> > dd if=/dev/zero of=/dev/nvd2 bs=100M status=progress
> > and you see that it's writing with the "whopping" speed of 70 MB/s.
> > That used to be good, but it is no longer good. Compare Amazon Linux
> > doing
> > the same thing at 300 MB/s.
> > Now, when you put a file system over it, zfs or ufs, then instantly the
> > performance gets better:
> > newfs /dev/nvd2
> > mount /dev/nvd2 /mnt
> > dd if=/dev/zero of=/mnt/test bs=100M status=progress
> > now that works at about 250 MB/s. Decent. So, problem solved?
> It is not clear if this compares Apple to Apple.
> What disk drives and CPUs are on FreeBSD, and what are disk drive(s) and
> CPU(s) on AWS?
> Knowing the drive brand and models will tell approximately the disk
> throughput. Agree, 70MB/s is slow for modern disks, but your information
> does not provide clue why this could be slow.
> Can this setup get 250MB/s on FreeBSD 11.4? or 300MB/s with Ubuntu 16.04
> on the same hardware?
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