em driver 6.6.6 regression

[Igor Sysoev]

On Wed, Nov 07, 2007 at 12:55:24PM +0300, Igor Sysoev wrote:

> On Wed, Nov 07, 2007 at 12:18:06PM +0300, Igor Sysoev wrote:
> 
> > On Fri, Oct 12, 2007 at 04:15:46PM +0400, Igor Sysoev wrote:
> > 
> > > Yesterday I have cvsup'ed FreeBSD on ThinkPad T42 to RELENG_6
> > > "2007.10.10.23.59.59" and have noticed lags while playing mp3 and browsing.
> > > I have suspected new em driver, because there was no lags if wifi iwi0
> > > was used instead of em0 for network. So I had downgraded the em driver
> > > separately to 6.2.9 version, have build a kernel loadable module, and have
> > > loaded it instead of the 6.6.6 module, and the lags have disappeared.
> > > 
> > > The lags appeares only if browser (Firefox, Opera) does several requests:
> > > main page, js, images. There are no lags if browser reload simple page.
> > > Also, I could not reproduce lags by other network traffic: pings, ssh, scp,
> > > downloading files. There are no lags if I compile and so on.
> > > 
> > > Some additional info:
> > > 
> > > The shared irq11 is used by pcm0, em0, iwi0, CardBus, USB, and acpi_video0.
> > > 
> > > em0 at pci2:1:0:   class=0x020000 card=0x05491014 chip=0x101e8086 rev=0x03 hdr=0x00
> > >     vendor     = 'Intel Corporation'
> > >     device     = '82540EP Gigabit Ethernet Controller (Mobile)'
> > 
> > I just cvsup'ed to the new em 6.7.2 version without FAST interrupt and
> > lags in sound and USB mouse has gone. Thank you.
> 
> However, if I define EM_FAST_IRQ, then lags appear again.

I've just rebuild RELENG_6 with EM_FAST_IRQ enabled and
with Scott Long's fix 1.14.2.5 of src/sys/i386/i386/intr_machdep.c
and all run without lags. Thank you.

em0: <Intel(R) PRO/1000 Network Connection Version - 6.7.2> port 0x8000-0x803f mem 0xc0220000-0xc023ffff,0xc0200000-0xc020ffff irq 11 at device 1.0 on pci2
em0: [FAST]


-- 
Igor Sysoev
http://sysoev.ru/en/