Re: Network stack changes

2013-09-14 Thread Luigi Rizzo
On Saturday, September 14, 2013, Olivier Cochard-Labbé wrote: > On Sat, Sep 14, 2013 at 4:28 PM, Luigi Rizzo wrote: >> >> IXIA ? For the timescales we need to address we don't need an IXIA, >> a netmap sender is more than enough >> > > The great netmap generates only one IP flow (same src/dst IP

Re: Network stack changes

2013-09-14 Thread Olivier Cochard-Labbé
On Sat, Sep 14, 2013 at 4:28 PM, Luigi Rizzo wrote: > > IXIA ? For the timescales we need to address we don't need an IXIA, > a netmap sender is more than enough > The great netmap generates only one IP flow (same src/dst IP and same src/dst port). This don't permit to test multi-queue NIC (or SM

Re: Network stack changes

2013-09-14 Thread Luigi Rizzo
On Fri, Sep 13, 2013 at 11:08:27AM -0400, George Neville-Neil wrote: > > On Aug 29, 2013, at 7:49 , Adrian Chadd wrote: ... > One quick note here. Every time you increase batching you may increase > bandwidth > but you will also increase per packet latency for the last packet in a batch. The o

Re: Network stack changes

2013-09-14 Thread Luigi Rizzo
On Fri, Sep 13, 2013 at 11:08:27AM -0400, George Neville-Neil wrote: > > On Aug 29, 2013, at 7:49 , Adrian Chadd wrote: ... > > I still have some tool coding to do with PMC before I even think about > > tinkering with this as I'd like to measure stuff like per-packet latency as > > well as top-le

Re: Network stack changes

2013-09-14 Thread Adrian Chadd
On 13 September 2013 15:43, Rick Macklem wrote: > And any time you increase latency, that will have a negative impact on > NFS performance. NFS RPCs are usually small messages (except Write requests > and Read replies) and the RTT for these (mostly small, bidirectional) > messages can have a sig

Re: Network stack changes

2013-09-14 Thread Rick Macklem
Sam Fourman Jr. wrote: > > > > > And any time you increase latency, that will have a negative impact > > on > > NFS performance. NFS RPCs are usually small messages (except Write > > requests > > and Read replies) and the RTT for these (mostly small, > > bidirectional) > > messages can have a sign

Re: Network stack changes

2013-09-14 Thread Sam Fourman Jr.
> > And any time you increase latency, that will have a negative impact on > NFS performance. NFS RPCs are usually small messages (except Write requests > and Read replies) and the RTT for these (mostly small, bidirectional) > messages can have a significant impact on NFS perf. > > rick > > this m