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Diffstat (limited to 'module/zfs/aggsum.c')
| -rw-r--r-- | module/zfs/aggsum.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/module/zfs/aggsum.c b/module/zfs/aggsum.c index e38f4a66c..e46da95f6 100644 --- a/module/zfs/aggsum.c +++ b/module/zfs/aggsum.c @@ -70,6 +70,11 @@ * zeroing out the borrowed value (forcing that thread to borrow on its next * request, which will also be expensive). This is what makes aggsums well * suited for write-many read-rarely operations. + * + * Note that the aggsums do not expand if more CPUs are hot-added. In that + * case, we will have less fanout than boot_ncpus, but we don't want to always + * reserve the RAM necessary to create the extra slots for additional CPUs up + * front, and dynamically adding them is a complex task. */ /* |