* Re: [LTP] [RFC] Testcase for recvmmsg(), a syscall for batching recvmsg() calls
[not found] ` <20100512212031.GI30926@ghostprotocols.net>
@ 2010-05-17 20:06 ` Subrata Modak
0 siblings, 0 replies; 2+ messages in thread
From: Subrata Modak @ 2010-05-17 20:06 UTC (permalink / raw)
To: Arnaldo Carvalho de Melo; +Cc: ltp-list
On Wed, 2010-05-12 at 18:20 -0300, Arnaldo Carvalho de Melo wrote:
> Em Wed, May 12, 2010 at 11:10:23PM +0530, Subrata Modak escreveu:
> > Hello Arnaldo,
> >
> > Your code in 2.6.33 kernel introduced a new system call called
> > recvmmsg(), a syscall for batching recvmsg() calls. Would you like to
> > share the set of test cases you used to test this new code with the LTP
> > community ?
>
> Forgive me my ignorance about the current state of the LTP
> infrastructure, but does it support requiring multiple clients and a
> server to test networking calls? Or is everything done over loopback?
Sorry for the very late reply. No, we also have something called LTP
network tests, which require a separate server and client, and is
designed to burn the network wires and not the loopback interface.
Your test seems interesting. I will like to integrate the code later in
our networking tests when i find time. If there is a more active
volunteer, he is welcome to do it before me ;-)
Regards--
Subrata
>
> The tests I did were basically:
>
> On several client machines:
>
> use netcat to continuously send datagrams to a destination machine on
> a specified port (5001, the ttcp one is used as a default)
>
> On the server:
>
> run the attached testcase, then I was basically visually looking that
> every batch received packets from multiple clients.
>
> I can envision a test where from the machine chosen to be the server a
> script like:
>
> #!/bin/sh
>
> ./recvmmsg &
>
> for client in $CLIENTS ; do
> ssh client ./run-netcat-script.sh $SERVER
> done
>
> # --- end ---
>
> The attached recvmmsg would somehow get the list of clients, check that
> they are the sendeds in datagrams in the same batch, and if so, woud
> emit a PASSED as output.
>
> Another question about the LTP infrastructure: Do it already supports
> collecting measurements in databases, associated to the kernel, libc,
> etc, versions, so that this can be used to generate plottings of metrics
> over time/kernel versions?
>
> - Arnaldo
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