Searched hist:"6 ca07079afcad5a0129c4bcf2662131fde11d823" (Results 1 – 3 of 3) sorted by relevance
| /freebsd/share/man/man4/ |
| H A D | ioat.4 | diff 6ca07079afcad5a0129c4bcf2662131fde11d823 Fri Jan 15 02:34:43 CET 2016 Conrad Meyer <cem@FreeBSD.org> ioat(4): Add support for 'fence' bit with DMA_FENCE flag
Some classes of IOAT hardware prefetch reads. DMA operations that
depend on the result of prior DMA operations must use the DMA_FENCE flag
to prevent stale reads.
(E.g., I've hit this personally on Broadwell-EP. The Broadwell-DE has a
different IOAT unit that is documented to not pipeline DMA operations.)
Sponsored by: EMC / Isilon Storage Division
|
| /freebsd/sys/dev/ioat/ |
| H A D | ioat.h | diff 6ca07079afcad5a0129c4bcf2662131fde11d823 Fri Jan 15 02:34:43 CET 2016 Conrad Meyer <cem@FreeBSD.org> ioat(4): Add support for 'fence' bit with DMA_FENCE flag
Some classes of IOAT hardware prefetch reads. DMA operations that
depend on the result of prior DMA operations must use the DMA_FENCE flag
to prevent stale reads.
(E.g., I've hit this personally on Broadwell-EP. The Broadwell-DE has a
different IOAT unit that is documented to not pipeline DMA operations.)
Sponsored by: EMC / Isilon Storage Division
|
| H A D | ioat.c | diff 6ca07079afcad5a0129c4bcf2662131fde11d823 Fri Jan 15 02:34:43 CET 2016 Conrad Meyer <cem@FreeBSD.org> ioat(4): Add support for 'fence' bit with DMA_FENCE flag
Some classes of IOAT hardware prefetch reads. DMA operations that
depend on the result of prior DMA operations must use the DMA_FENCE flag
to prevent stale reads.
(E.g., I've hit this personally on Broadwell-EP. The Broadwell-DE has a
different IOAT unit that is documented to not pipeline DMA operations.)
Sponsored by: EMC / Isilon Storage Division
|