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clarify in man page: we count by powers of two

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Make clear in the man page, in both the bandwidth section and the
accountingmax section, that Tor counts in powers of two, not
powers of ten: 1 GByte is 1024*1024*1024 bytes, not one billion
bytes.

Resolves ticket 32106.
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Roger Dingledine 2019-10-16 06:13:14 -04:00 committed by teor
parent 2ed194c9a9
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@ -0,0 +1,5 @@
o Minor features (documentation):
- Make clear in the man page, in both the bandwidth section and the
accountingmax section, that Tor counts in powers of two, not
powers of ten: 1 GByte is 1024*1024*1024 bytes, not one billion
bytes. Resolves ticket 32106.

17
doc/tor.1.txt
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@ -210,11 +210,15 @@ GENERAL OPTIONS
+
Note that this option, and other bandwidth-limiting options, apply to TCP
data only: They do not count TCP headers or DNS traffic. +
+
Tor uses powers of two, not powers of ten, so 1 GByte is
1024*1024*1024 bytes as opposed to 1 billion bytes. +
+
With this option, and in other options that take arguments in bytes,
KBytes, and so on, other formats are also supported. Notably, "KBytes" can
also be written as "kilobytes" or "kb"; "MBytes" can be written as
"megabytes" or "MB"; "kbits" can be written as "kilobits"; and so forth.
Case doesn't matter.
Tor also accepts "byte" and "bit" in the singular.
The prefixes "tera" and "T" are also recognized.
If no units are given, we default to bytes.
@ -2292,9 +2296,9 @@ is non-zero):
using a given calculation rule (see: AccountingStart, AccountingRule).
Useful if you need to stay under a specific bandwidth. By default, the
number used for calculation is the max of either the bytes sent or
received. For example, with AccountingMax set to 1 GByte, a server
could send 900 MBytes and receive 800 MBytes and continue running.
It will only hibernate once one of the two reaches 1 GByte. This can
received. For example, with AccountingMax set to 1 TByte, a server
could send 900 GBytes and receive 800 GBytes and continue running.
It will only hibernate once one of the two reaches 1 TByte. This can
be changed to use the sum of the both bytes received and sent by setting
the AccountingRule option to "sum" (total bandwidth in/out). When the
number of bytes remaining gets low, Tor will stop accepting new connections
@ -2305,7 +2309,12 @@ is non-zero):
enabling hibernation is preferable to setting a low bandwidth, since
it provides users with a collection of fast servers that are up some
of the time, which is more useful than a set of slow servers that are
always "available".
always "available". +
+
Note that (as also described in the Bandwidth section) Tor uses
powers of two, not powers of ten: 1 GByte is 1024*1024*1024, not
one billion. Be careful: some internet service providers might count
GBytes differently.
[[AccountingRule]] **AccountingRule** **sum**|**max**|**in**|**out**::
How we determine when our AccountingMax has been reached (when we