packet drop with intel gigabit / marwell gigabit

[OxY]

i increased hz from 2000 to 5000, now the packet loss is decreased
from 5-6% to 0.6-0,8% !!!
huge improve!
should i increase hz more?

----- Original Message ----- 
From: "OxY" <oxy at field.hu>
To: "Chuck Swiger" <cswiger at mac.com>
Cc: <freebsd-performance at freebsd.org>
Sent: Saturday, March 18, 2006 2:23 PM
Subject: Re: packet drop with intel gigabit / marwell gigabit


> currently i use HZ=2000
> here's the output of netstat -i, -s, and vmstat -i :
> (currently i am uploading on the gigabit with ftp, 3 threads)
>
> Field root# vmstat -i
> interrupt                          total       rate
> irq0: clk                       27503959       1993
> irq1: atkbd0                           1          0
> irq3: fxp0                             2          0
> irq7:                                146          0
> stray irq7                           146          0
> irq8: rtc                        1765569        127
> irq10: atapci1                   2807786        203
> irq11: atapci0                    475039         34
> irq13: npx0                            1          0
> irq14: ata0                           99          0
> Total                           32552748       2359
>
> Field root# netstat -i
> Name    Mtu Network       Address              Ipkts Ierrs    Opkts Oerrs 
> Coll
> fxp0   1500 <Link#1>      00:a0:c9:8d:79:68 13163545     0 21899372     1 
> 0
> fxp0   1500 195.38.96.64/ field                  141     - 
> 6     -     -
> em0    1500 <Link#2>      00:0e:0c:a2:ac:42 68644181     4 66793904     0 
> 0
> em0    1500 195.38.96.64/ field             211255811     - 
>      -     -
> lo0   16384 <Link#3>                        129622061     0 129622061 
> 0 0
>
> netstat -s is here:
> http://field.hu/netstat.txt
>
> ----- Original Message ----- 
> From: "Chuck Swiger" <cswiger at mac.com>
> To: "OxY" <oxy at field.hu>
> Cc: <freebsd-performance at freebsd.org>
> Sent: Saturday, March 18, 2006 1:37 PM
> Subject: Re: packet drop with intel gigabit / marwell gigabit
>
>
>> OxY wrote:
>>> yeah, i googled these settings, but i put them back to default then!
>>> i measured iperf performance, and it showed that the packet drop is
>>> depending on the system load..
>>
>> If you are using the normal interrupt-driven configuration, you should 
>> look at
>> netstat -i, -s, and vmstat -i.  If you're turning on device polling, you 
>> ought
>> to retry your testing at higher HZ (try 2000 or 5000):
>>
>>   echo 'kern.hz="2000"' >> /boot/loader.conf
>>
>> -- 
>> -Chuck
>
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