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| author | kfraser@localhost.localdomain <kfraser@localhost.localdomain> | 2006-11-01 11:18:29 +0000 |
|---|---|---|
| committer | kfraser@localhost.localdomain <kfraser@localhost.localdomain> | 2006-11-01 11:18:29 +0000 |
| commit | 7ffcc43b02744f2ec9a064635ff09ea17c0a7253 (patch) | |
| tree | 0731809d2480fa9813c11b193335e6aa144d9e9f /docs/src | |
| parent | aeade7ad12cc2efefe88d19fb03a62c263aae885 (diff) | |
| download | xen-7ffcc43b02744f2ec9a064635ff09ea17c0a7253.tar.gz xen-7ffcc43b02744f2ec9a064635ff09ea17c0a7253.tar.bz2 xen-7ffcc43b02744f2ec9a064635ff09ea17c0a7253.zip | |
[XEN] Extend dom0_mem syntax to support min/max clamps.
dom0_mem=[min:<min_amt>,][max:<max_amt>,][<amt>]
<min_amt>: The minimum amount of memory which should be allocated for dom0.
<max_amt>: The maximum amount of memory which should be allocated for dom0.
<amt>: The precise amount of memory to allocate for dom0.
Notes:
1. <amt> is clamped from below by <min_amt> and from above by available
memory and <max_amt>
2. <min_amt> is clamped from above by available memory and <max_amt>
3. <min_amt> is ignored if it is greater than <max_amt>
4. If <amt> is not specified, it is calculated as follows:
"All of memory is allocated to domain 0, minus 1/16th which is reserved
for uses such as DMA buffers (the reservation is clamped to 128MB)."
Each value can be specified as positive or negative:
If +ve: The specified amount is an absolute value.
If -ve: The specified amount is subtracted from total available memory.
Signed-off-by: Keir Fraser <keir@xensource.com>
Diffstat (limited to 'docs/src')
| -rw-r--r-- | docs/src/user.tex | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/docs/src/user.tex b/docs/src/user.tex index 6b4e5cfa72..768b22165a 100644 --- a/docs/src/user.tex +++ b/docs/src/user.tex @@ -3202,12 +3202,21 @@ editing \path{grub.conf}. ignored. This parameter may be specified with a B, K, M or G suffix, representing bytes, kilobytes, megabytes and gigabytes respectively. The default unit, if no suffix is specified, is kilobytes. -\item [ dom0\_mem=xxx ] Set the amount of memory to be allocated to - domain0. In Xen 3.x the parameter may be specified with a B, K, M or +\item [ dom0\_mem=$<$specifier list$>$ ] Set the amount of memory to + be allocated to domain 0. This is a comma-separated list containing + the following optional components: + \begin{description} + \item[ min:$<$min\_amt$>$ ] Minimum amount to allocate to domain 0 + \item[ max:$<$min\_amt$>$ ] Maximum amount to allocate to domain 0 + \item[ $<$amt$>$ ] Precise amount to allocate to domain 0 + \end{description} + Each numeric parameter may be specified with a B, K, M or G suffix, representing bytes, kilobytes, megabytes and gigabytes respectively; if no suffix is specified, the parameter defaults to - kilobytes. In previous versions of Xen, suffixes were not supported - and the value is always interpreted as kilobytes. + kilobytes. Negative values are subtracted from total available + memory. If $<$amt$>$ is not specified, it defaults to all available + memory less a small amount (clamped to 128MB) for uses such as DMA + buffers. \item [ dom0\_vcpus\_pin ] Pins domain 0 VCPUs on their respective physical CPUS (default=false). \item [ tbuf\_size=xxx ] Set the size of the per-cpu trace buffers, in |