El 22/09/14 a les 10.27, Hans Petter Selasky ha escrit: > Author: hselasky > Date: Mon Sep 22 08:27:27 2014 > New Revision: 271946 > URL: http://svnweb.freebsd.org/changeset/base/271946 > > Log: > Improve transmit sending offload, TSO, algorithm in general. > > The current TSO limitation feature only takes the total number of > bytes in an mbuf chain into account and does not limit by the number > of mbufs in a chain. Some kinds of hardware is limited by two > factors. One is the fragment length and the second is the fragment > count. Both of these limits need to be taken into account when doing > TSO. Else some kinds of hardware might have to drop completely valid > mbuf chains because they cannot loaded into the given hardware's DMA > engine. The new way of doing TSO limitation has been made backwards > compatible as input from other FreeBSD developers and will use > defaults for values not set. > > Reviewed by: adrian, rmacklem > Sponsored by: Mellanox Technologies
This commit makes xen-netfront tx performance drop from ~5Gbits/sec (with debug options enabled) to 446 Mbits/sec. I'm currently looking, but if anyone has ideas they are welcome. Roger. _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "[email protected]"
