netperf

[Sebastian Sumpf]

On 01/28/2014 12:59 PM, Christian Helmuth wrote:
> Hello Anna,
> 
> welcome to the list ;-)
> 
> On Tue, Jan 28, 2014 at 02:58:35PM +0400, Анна Будкина wrote:
>> I'm measuring throughput between two hosts. I use genode running on
>> fiasco.OC on one machine and monolithic Linux on another machine. There's
>> 82579LM NIC on each host. I'm running netperf_lxip.run script. As acpi
>> driver doesn't work on my machine i'm using pci_drv driver. Another problem
>> is that level-triggered interrupts are not recieved and i'm polling
>> interrupts in the internal cycle in /os/src/lib/dde_kit/interrupt.cc:
> [...]
> 
> I was slightly astonished by the bad benchmark results. So, I tried
> today's Genode master with the following scenario:
> 
>   * Genode on Lenovo T61 (82566mm, PCIe 8086:1049)
>   * Linux on T410 (82577LM, PCIe 8086:10ea)
> 
> With your patch I got
> 
>   ! PERF: TCP_STREAM              2.02 MBit/s
>   ! PERF: TCP_MAERTS              8.00 MBit/s
> 
> This substantiates my assumption that your implemented "polling"
> degrades the performance significantly. The original code without
> polling produces
> 
>   ! PERF: TCP_STREAM              65.59 MBit/s
>   ! PERF: TCP_MAERTS              543.35 MBit/s
> 
> which is no top-notch result, but looks more promising. We did not
> investigate the performance drop on TCP_STREAM up to now, but suspect
> the NIC driver or its integration to be the cause.
> 

Thanks for your tests! But I don't like the 65 MBit/s thing! What is
going on? Is this RX or TX?

Sebastian

-- 
Sebastian Sumpf
Genode Labs

http://www.genode-labs.com · http://genode.org

Genode Labs GmbH · Amtsgericht Dresden · HRB 28424 · Sitz Dresden
Geschäftsführer: Dr.-Ing. Norman Feske, Christian Helmuth