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| -rw-r--r-- | host/docs/transport.rst | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/host/docs/transport.rst b/host/docs/transport.rst index e7c2f1885..f28d1efcb 100644 --- a/host/docs/transport.rst +++ b/host/docs/transport.rst @@ -38,6 +38,14 @@ increase or decrease the maximum number of samples per packet. The frame sizes default to an MTU of 1472 bytes per IP/UDP packet, and may be increased if permitted by your network hardware. +**Note3:** For lower latency at low sample rates, use smaller buffers + +**Note4:** For overall lower latency, look for Interrupt Coalescing settings +for your OS and ethernet chipset. It seems the Intel ethernet chipsets offer +fine-grained control in Linux. Also, consult: + +* http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.prftungd/doc/prftungd/interrupt_coal.htm + ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Flow control parameters ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -77,6 +85,16 @@ To change the maximum values, run the following commands: Set the values permanently by editing */etc/sysctl.conf* +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Windows specific notes +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +On Windows, it is important to change the default UDP behavior such that +1500 byte packets still travel through the fast path of the sockets stack. + +FastSendDatagramThreshold registry key to change documented here: + +* http://www.microsoft.com/windows/windowsmedia/howto/articles/optimize_web.aspx#appendix_e + ------------------------------------------------------------------------ USB transport (libusb) ------------------------------------------------------------------------ |