em driver 6.6.6 regression

[Igor Sysoev]

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.

Sorry, now I have noticed that audio lags are possible even for
single HTTP request/tiny 304 response if site is far from me.

> 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)'


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