Merge #15163: Correct units for "-dbcache" and "-prune"

6f6514a08090b37b5e8c086015ee4881813ef867 Correct units for "-dbcache" and "-prune" (Hennadii Stepanov)

Pull request description:

  Actually, all `dbcache`-related values in the code are measured in MiB (not in megabytes, MB) or in bytes (e.g., `nTotalCache`).

  See: https://github.com/bitcoin/bitcoin/blob/master/src/txdb.h

  https://github.com/bitcoin/bitcoin/blob/ba8c8b22272ad40fe2de465d7e745532bab48d3b/src/init.cpp#L1405-L1424

  Also, "-prune" is fixed:
  1. The GUI values in GB are translated to the node values in MiB correctly.
  2. The maximum of the "prune" `QSpinBox` is not limited by default value of 99 (GB).

  Fix: #15106

Tree-SHA512: 151ec43b31b1074db8b345fedb1dcc10bde225899a5296bfc183f57e1553d13ac27db8db100226646769ad03c9fcab29d88763065a471757c6c41ac51108459d

1 files changed, 2 insertions, 2 deletions

diff --git a/src/validation.h b/src/validation.h
index 4f70eb645f..b16d8438d7 100644
--- a/src/validation.h
+++ b/src/validation.h
@@ -201,14 +201,14 @@ static const unsigned int NODE_NETWORK_LIMITED_MIN_BLOCKS = 288;
 static const signed int DEFAULT_CHECKBLOCKS = 6;
 static const unsigned int DEFAULT_CHECKLEVEL = 3;
 
-// Require that user allocate at least 550MB for block & undo files (blk???.dat and rev???.dat)
+// Require that user allocate at least 550 MiB for block & undo files (blk???.dat and rev???.dat)
 // At 1MB per block, 288 blocks = 288MB.
 // Add 15% for Undo data = 331MB
 // Add 20% for Orphan block rate = 397MB
 // We want the low water mark after pruning to be at least 397 MB and since we prune in
 // full block file chunks, we need the high water mark which triggers the prune to be
 // one 128MB block file + added 15% undo data = 147MB greater for a total of 545MB
-// Setting the target to > than 550MB will make it likely we can respect the target.
+// Setting the target to >= 550 MiB will make it likely we can respect the target.
 static const uint64_t MIN_DISK_SPACE_FOR_BLOCK_FILES = 550 * 1024 * 1024;
 
 /**