On 2012-04-12 09:51 -0700, Ben Greear wrote Florian Fainelli:

BG>On 04/12/2012 09:42 AM, Florian Fainelli wrote:
BG>> Hi,
BG>> 
BG>> Le 04/12/12 18:32, greearb@candelatech.com a ?crit :
BG>> > From: Ben Greear<greearb@candelatech.com>
BG>> > 
BG>> > The signal and noise are forced to be positive since ethtool
BG>> > deals in unsigned 64-bit values and this number should be human
BG>> > readable. This gives easy access to some of the data formerly
BG>> > exposed in the deprecated /proc/net/wireless file.
BG>> 
BG>> Uh, that's misleading, the signal and noise values are typically negative,
BG>> so one needs to think about mentally adding a minus sign if he/she wants to
BG>> understand it. Does not ethtool know about 32-bits signed integers?
BG>
BG>Ethtool stats only supports u64.  I think it's easy enough for
BG>humans or programs to add the negative sign.  Can signal or noise
BG>ever be > 0?  If so, that could actually break something that depends
BG>on flipping the value to negative....

Don't know is this is a bug or it's reaaly can be positive, but:

iw dev mp0 station dump
Station 00:02:6f:b8:94:d3 (on mp0)
    inactive time:	49 ms
    rx bytes:	36318341
    rx packets:	271741
    tx bytes:	4180152
    tx packets:	35445
    tx retries:	7724
    tx failed:	123
    signal:  	1 dBm
    signal avg:	-2 dBm
    tx bitrate:	240.0 MBit/s MCS 13 40Mhz short GI
    rx bitrate:	180.0 MBit/s MCS 12 40Mhz short GI
    mesh llid:	8349
    mesh plid:	49801
    mesh plink:	ESTAB
    authorized:	yes
    authenticated:	yes
    preamble:	long
    WMM/WME:	yes
    FP:		no
    TDLS peer:	no
										    

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