problem with Marwell gigabit performance

[OxY]

i forgot to mention the load is twice, than before and the transfer is speed 
is
decreased from 20mbyte/s to 9mbyte/s

----- Original Message ----- 
From: "OxY" <oxy at field.hu>
To: <freebsd-net at freebsd.org>
Sent: Wednesday, March 15, 2006 4:40 PM
Subject: Re: problem with Marwell gigabit performance


> with the modified sk(4) driver i got the following:
>
> sk0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>        options=2b<RXCSUM,TXCSUM,VLAN_MTU,JUMBO_MTU>
>
> the performance didn't changed, packet drops as usual...
> when the system is 100% idle, packet drop is around 1%,
> when i got ~0.80 load on the other (fxp0) interface, packet drop is 8-11%
> may i change the card to intel or 3com, or what to do?
>
> ----- Original Message ----- 
> From: "Pyun YongHyeon" <pyunyh at gmail.com>
> To: "OxY" <oxy at field.hu>
> Cc: <freebsd-net at freebsd.org>
> Sent: Wednesday, March 15, 2006 1:18 AM
> Subject: Re: problem with Marwell gigabit performance
>
>
>> On Tue, Mar 14, 2006 at 11:48:14AM +0100, OxY wrote:
>> > hi!
>> >
>> > i have a Marwell (SMC) gigabit ethernet card (sk0) and have serious 
>> > problems with performance..
>> > the machine is a pc, amd 2000+ xp, 512mb ram.
>> >
>> > tested with iperf (bidirectional test, udp transfer, not stream)
>> > and got 8-15% packet drop when the system was idle.
>> >
>>
>> There is a modified sk(4) driver at
>> http://people.freebsd.org/~yongari/sk/sk_test/if_sk.c
>> http://people.freebsd.org/~yongari/sk/sk_test/if_skreg.h
>>
>> Would you please give it try?
>> I can't sure but you would get better results as the new driver
>> uses one lock for standard MTU size and supports Tx TCP checksum
>> offload and Rx IP checksum offload.
>> I could push 32bit PCI NIC(DGE-530T) to the PCI bus limit on sparc64.
>>
>> > then tuned the sysctl with these settings:
>> >
>> > kern.ipc.maxsockbuf=81920000
>> > kern.ipc.nmbclusters=5000000000
>> > kern.ipc.somaxconn=8192
>> > net.inet.tcp.inflight.enable=1
>> > net.inet.raw.recvspace=4096
>> > net.inet.tcp.recvspace=131072
>> > kern.ipc.shmmax=409600000
>> >
>> > with these i got around 3-7% packet drop,
>> > but it's very high compared to zero :)
>> >
>> > my question is where/what should i optimize to not
>> > have packet drop at all, or at least reduce it as much as
>> > possible.
>> >
>> > thanks for your help!
>> >
>> > Csaba Banhalmi, HU
>> -- 
>> Regards,
>> Pyun YongHyeon
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