Re: xen 3.1 problem (Re: xen 3.1.0 is there)

[Kazushi (Jam) Marukawa <jam%pobox.com@localhost>]

Hi,

   On Jun 26, 20:06, Manuel Bouyer wrote:
   > Subject: Re: xen 3.1 problem (Re: xen 3.1.0 is there)
   > On Wed, Jun 27, 2007 at 01:49:08AM +0900, Kazushi Marukawa wrote:
   > 
   > Does it still happens with yesterday's commit which did fix a race in
   > cpu_idle() ? I can't see how this commit could fix the KASSERT issue, but
   > who knows ...

Yes, it happens, unfortunately.  I needed to apply my
locore.S patch to run WinXP on hvm with Xen 3.0.4.  I forgot
to try with Xen 3.1.0.  I'm not going to reboot my machine
to try it again for now.  If you want to see the result with
Xen 3.1.0, please let me know.  I can try.

   > > However, the related issue, slow hvm is not solved yet.
   > > When I use WinXP with recent kernel, I feel it is much
   > > slower than 4.99.18.  I feel something like below.
   > > e.g. 4.99.21 Xen3.1.0 took 30 sec to open empty start menu.
   > 
   > again, maybe yesterday commits fixed it ... please try !

BTW, this works great.  Now WinXP on hvm runs as normal with
both Xen 3.0.4 and 3.1.0 after applying locore.S patch.
Many thanks.  I changed my environment to the 4.99.21.  ;-)


However, I'm having several new minor problems with this
latest kernel.  They are all minor, but I want to let them
know in public.  Maybe some of them are problems for only my
environment.  hehe.  Please let me know how others feel.

Here is a list of them.

1. the latest NetBSD DomU runs slower than before and Dom0.
2. the latest NetBSD DomU ask me the root partition when it
   boots.
3. the WinXP on the latest NetBSD Dom0 doesn't show better
   network performance for me.

Let me explain more details.

1st problem: I'm not sure when this started but the latest
  NetBSD DomU runs slower.  Here is a simple benchmark
  result.  The benchmark is to run mkid several times under
  20070624's sys directory and pick one generally good time
  from results.

src date                        dom0 time       domu time
0518 on Xen3.0.4                10.614          9.757
0624 w/ patch on Xen3.0.4       10.650          16.938  <- slow
0624 w/ patch on Xen3.1.0       10.625          9.638
0627 w/ patch on Xen3.0.4       10.640          17.283  <- slow
0627 w/ patch on Xen3.1.0       10.524          16.817  <- slow

I was thinking this is caused since the recent kernel is
optimized for Xen3.1.0, but 0627 kernel runs slower on both.

2nd problem: DomU ask me what is the boot device.  I
  answered xbd0 is root, dump is xbd0b, file system is lfs,
  and init path is /sbin/init.  It works fine after that,
  but I need to let NetBSD DomU knows them each time.

3rd problem: This is not a real problem.  I just saw the
  throughput of WinXP on NetBSD Dom0 and Xen3.1.0 is similar
  to the WinXP on NetBSD Dom0 and Xen4.0.3.  Just wondering
  how much throughput others are having now.  Mine shows
  4 times slower than standalone WinXP.


Anyway, thank Manuel.  4.99.21 is working good to me now.  :-)

Regards,
-- Kazushi
I am so optimistic about beef prices that I've just leased a pot roast
with an option to buy.