AMD64 much slower than i386 on FreeBSD 5.4-pre

[Boris Spirialitious]

I think you may be right. I try Broadcom gigE card
with same results. Very slow for amd64 build. With
same hardware, very good results with 4.9/i386, 
not too bad with 5.4-pre/i386, and very, very
poor with 5.4-pre/amd64.

Boris

--- em1897 at aol.com wrote:
> I think the point of a list is so that someone can
> say "oh yes, I had 
> problems with the
> em driver in amd64 also; try card X." But instead
> you get a lot of 
> people with no real
> idea trying to explain away the problem, as if there
> is no chance that 
> the amd64
> implementant just plain sucks wind. If someone who
> actually has an 
> amd64 build
> could post some usage/load numbers, or someone who
> did some testing 
> with
> various hardware, that might be useful.  So far what
> we have is like a 
> bunch of
> Mothers trying to defend their children without
> having any viable 
> answers or
> evidence than amd64 is any good at all. Only a
> people who say 
> nonsensical
> things like "my opteron blows away any P4", like a
> kid bragging about 
> his
> mustang or something.
> 
> The em driver has a standard hold-off of 8000
> ints/second, so thats not 
> likely
> the problem. Its likely to be the same in both i386
> and amd64, so its a
> control.
> 
> 
> <snippage> 
> So the whole interrupt/process switching mechanism
> runs like crap with 
> the amd64 build? Since I don't have a amd64 system,
> and you might hav 
> access to atleast 1, how about getting a little info
> on the irqs? Look 
> at systat -vmstat or vmstat -i under load? aybe
> report it back? I 
> wonder if the irq rates are changing, or irqs are
> taking longer to 
> service. Either there is a problem. Ofcourse some
> hardware info would 
> be nice, chipset and cpu? Maybe you script vmstat -i
> for a log, and use 
> netperf too?  
> I like Nick's followup. I would guese Boris may have
> a problem with 
> proper hardware support. I can't really said it is
> bad hardware if 
> speeds are the same, just high load(right?). Maybe
> the driver he is 
> using is not good for 64bit as it is for 32bit? 
>  
> I think if Boris studies the thread I like to below
> he will be alright. 
>  
> Check this out: 
>
http://www.atm.tut.fi/list-archive/freebsd-stable/thrd66.html 
>
http://docs.freebsd.org/cgi/mid.cgi?200502171636.10361.drice 
>  
> Inparticular: 
>
http://www.atm.tut.fi/list-archive/freebsd-stable/msg19651.html 
>
http://www.atm.tut.fi/list-archive/freebsd-stable/msg19679.html 
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