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author | Keir Fraser <keir.fraser@citrix.com> | 2008-07-28 16:40:30 +0100 |
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committer | Keir Fraser <keir.fraser@citrix.com> | 2008-07-28 16:40:30 +0100 |
commit | accacb43cb7f16e9d1d8c0e58ea72c9d0c32cec2 (patch) | |
tree | 9e21d55e5445902259ffe7159aed8f6ba9dc8422 /docs | |
parent | f5219467e716306e268d8939b53f3b7afe3106b0 (diff) | |
download | xen-accacb43cb7f16e9d1d8c0e58ea72c9d0c32cec2.tar.gz xen-accacb43cb7f16e9d1d8c0e58ea72c9d0c32cec2.tar.bz2 xen-accacb43cb7f16e9d1d8c0e58ea72c9d0c32cec2.zip |
Simplify 'dma heap' logic.
1. Only useful for NUMA systems, so turn it off on non-NUMA systems by
default.
2. On NUMA systems, by default relate the DMA heap size to NUMA node 0
memory size (so that not all of node 0's memory ends up being 'DMA
heap').
3. Remove the 'dma emergency pool'. It's less useful now that running
out of low memory isn;t as fatal as it used to be (e.g., when we
needed to be able to allocate low-memory PAE page directories).
Based on patches by Andre Przywara and Xiaowei Yang.
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
Diffstat (limited to 'docs')
-rw-r--r-- | docs/src/user.tex | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/docs/src/user.tex b/docs/src/user.tex index 33d4a213be..59f5a8a9e4 100644 --- a/docs/src/user.tex +++ b/docs/src/user.tex @@ -4204,11 +4204,9 @@ writing to the VGA console after domain 0 starts booting (e.g., `vga=text-80x50, enabled by the BIOS. \item [ apic=bigsmp,default,es7000,summit ] Specify NUMA platform. This can usually be probed automatically. -\item [ dma\_bits=xxx ] Specify width of DMA - addresses in bits. Default is 30 bits (addresses up to 1GB are DMAable). -\item [ dma\_emergency\_pool=xxx ] Specify lower bound on size of DMA - pool below which ordinary allocations will fail rather than fall - back to allocating from the DMA pool. +\item [ dma\_bits=xxx ] Specify width of DMA addresses in bits. This + is used in NUMA systems to prevent this special DMA memory from + being exhausted in one node when remote nodes have available memory. \end{description} In addition, the following options may be specified on the Xen command |