In case of cache miss, I assume there's no way to tell CPU to keep the data in the cache? The structs related to processing is all below cache line size. (the test code is very crude one, not really much processing done)
On the dedicated thread polling sockets... could I move away net and use syscall & poll to implement low latency? But then again I'm seeing this similar behaviour on my C code too. Thanks On Saturday, 30 July 2022 at 03:16:09 UTC+3 ren...@ix.netcom.com wrote: > Since the net IO is abstracted away from you, the answer is ’not usually’. > > The usual solution is dedicated threads that constantly poll the sockets, > or hardware support + real-time threads, etc. > > BUT, typically this is not what you are experiencing. More likely, the cpu > cache gets cold - so the operations can take 10x longer - especially on a > multi-use/user system - so it is actually your processing code that is > taking longer. > > You can probably use ‘perf’ on the process to monitor the cache misses. > > On Jul 29, 2022, at 7:08 PM, TH <tins...@gmail.com> wrote: > > Hey, > > Bit confused on how stdlib net is implemented, but I'm noticing round trip > >150µs latencies on idle connections (loopback). Round trip latency will > drop to <20µs if sent packets constantly. > > I assume that this latency is caused by kernel / syscall wakeup to > indicate that new data has arrived. Are there any methods to minimize this > wakeup latency? > > Thanks > > > -- > You received this message because you are subscribed to the Google Groups > "golang-nuts" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to golang-nuts...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/golang-nuts/87deab65-b441-42ce-b51b-663651ecfccbn%40googlegroups.com > > <https://groups.google.com/d/msgid/golang-nuts/87deab65-b441-42ce-b51b-663651ecfccbn%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/a6d4d1ed-d1e9-4a60-a346-83b5eadd2d68n%40googlegroups.com.
