netdev - Re: Patch for tbench regression.

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Message-ID: <20080929072017.GA24300@gondor.apana.org.au>
Date:	Mon, 29 Sep 2008 15:20:17 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
Cc:	netdev@...r.kernel.org,
	Christoph Lameter <cl@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>, David Miller <davem@...emloft.net>,
	Lennert Buytenhek <buytenh@...vell.com>
Subject: Re: Patch for tbench regression.

On Mon, Sep 29, 2008 at 11:11:19AM +0400, Evgeniy Polyakov wrote:
>
> How did you find that? :)

Because your PIC looks normal.  You'll know when you're in PV
Xen because it looks like this:

           CPU0              CPU1              
  1:          2          0        Phys-irq  i8042
  7:          0          0        Phys-irq  parport0
  8:          0          0        Phys-irq  rtc
  9:          0          0        Phys-irq  acpi
 12:          4          0        Phys-irq  i8042
 14:   14710832   47935559        Phys-irq  ide0
 15:   11484815   42035535        Phys-irq  ide1
 16:          0          0        Phys-irq  uhci_hcd:usb1
 17:          0          0        Phys-irq  libata
 18:          0          0        Phys-irq  uhci_hcd:usb5, ehci_hcd:usb6
 19:        212         90        Phys-irq  uhci_hcd:usb4, libata
 20:          0          0        Phys-irq  uhci_hcd:usb2
 21:          2          0        Phys-irq  uhci_hcd:usb3, ehci_hcd:usb7
 22: 1038949859          0        Phys-irq  peth0
 23:        216          0        Phys-irq  HDA Intel
256: 1006488099          0     Dynamic-irq  timer0
257:   64033545          0     Dynamic-irq  resched0
258:         98          0     Dynamic-irq  callfunc0
259:          0   85739450     Dynamic-irq  resched1
260:          0        183     Dynamic-irq  callfunc1
261:          0  271431605     Dynamic-irq  timer1
262:       6778      16816     Dynamic-irq  xenbus
263:          0          0     Dynamic-irq  console
NMI:          0          0 
LOC:          0          0 
ERR:          0
MIS:          0

> Yes, of course, even single empty syscall may potentially force process
> the be scheduled away, bit still performance will not be with 24/190
> ratio... Weird.

I don't think PV/FV is the issue anyway since we're both on FV :)

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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