On Fri, May 27, 2016 at 1:12 PM, Garrett Cooper <n...@freebsd.org> wrote: > Author: ngie > Date: Fri May 27 20:12:32 2016 > New Revision: 300868 > URL: https://svnweb.freebsd.org/changeset/base/300868 > > Log: > Remove note about bogus chain-len maximum > > There's no current limit on chain-len with Broadwell DE chips; it isn't > enforced in software, and there doesn't appear to be a hardware limitation > either on the Intel Xeon D-1527 (Broadwell-DE) chip.
Hi Ngie, The note isn't bogus, it's just not what you think it is—the limit is in the ioat_test code, not a limit of the hardware. Before this commit which documented it (r289733), the limit *was* 4. However, in the same commit I bumped the limit up to 128 (IOAT_MAX_BUFS / 2). (I suspect I wrote the documentation first, before deciding to raise the limit.) So the current limit is 128, and should be documented. Thanks, Conrad _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
