Hi All I'm working on an Ethernet driver for FreeBSD 7.0. Taking network performance numbers I encountered very long mbuf chains on the sender side.
The symptom is constant, always during iperf/netperf TCP stream tests with message sizes of 128 bytes (>200 mbufs per chain), 1024 bytes (30-60 mbufs per chain) and 2048 bytes. My problem is that long chains require some kind of defragmentation/cutting before it can be properly DMAd. This is pretty a expansive operation. 1. Is there a way of tuning the OS for sending limited length mbuf chains? I thought setting "net.inet.ip.maxfragsperpacket" would do it but it doesn't. 2. Is there a better way of handling this issue? Thanks, Yony _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
