All,
After reading and replying to Al's comments about how percent should be
handled, I coded up the unit string conversion function as follows.
Note: I did not make any changes to deal with the cases where the
textual representation of based and/or modifier is "unspecified" in the
two base/modifier or base*modifier units display.
Anyone know a good reason why the display is "Base * Modifier" (with
spaces) and "Base/Modifier" (without spaces)? If not, I'm going to
make them both consistent by adding the extra spaces to the divide case.
Any/All comments and questions would be much appreciated.
/* ipmi_sdr_get_unit_string - return units for base/modifier
*
* @pct: units are a percentage
* @type: unit type
* @base: base
* @modifier: modifier
*
* returns pointer to static string
*/
char *
ipmi_sdr_get_unit_string(uint8_t pct, uint8_t type, uint8_t base,
uint8_t modifier)
{
static char unitstr[16];
/*
* By default, if units are supposed to be percent, we will
pre-pend
* the percent string to the textual representation of the units.
*/
char *pctstr = pct ? "% " : "";
memset(unitstr, 0, sizeof (unitstr));
switch (type) {
case 2:
snprintf(unitstr, sizeof (unitstr), "%s%s * %s",
pctstr, unit_desc[base], unit_desc[modifier]);
break;
case 1:
snprintf(unitstr, sizeof (unitstr), "%s%s/%s",
pctstr, unit_desc[base], unit_desc[modifier]);
break;
case 0:
default:
/*
* Display the text "percent" only when the Base unit is
* "unspecified" and the caller specified to print percent.
*/
if (base == 0 && pct) {
snprintf(unitstr, sizeof(unitstr), "percent");
} else {
snprintf(unitstr, sizeof (unitstr), "%s%s",
pctstr, unit_desc[base]);
}
break;
}
return unitstr;
}
-- Jim Mankovich | [email protected] --
On 2/8/2012 12:04 PM, Jim Mank wrote:
> Al,
>
> It does appear from the spec that percent can be applied to any validly
> specified Unit given that is an independent bit that can be specified in
> addition to the Base/Modifier units. I could not find any other text
> about the percent interpretation.
>
> If this is the spec intent, then when the percent bit is a one and the
> Base Unit is "unspecified", a textural string of "percent" or "%" could
> be used as the display string for the units. This would directly
> address what was reported as the bug, but would not address what you
> pointed out. This is the only case I took into account with I have
> done because the interpretation of the pct bit was not clearly
> articulated in the spec.
>
> When the percent bit is a one and the Base Unit has a value != 0, then
> pre-pending the string "percent" or "%" to the Base Unit makes sense to
> me. I specifically avoided talking about applying percent to the
> Modifier Unit since it only seems to make sense to apply percent to the
> entire entity when both Base and Modifier are specified.
>
> I do have some concern that decoding the percent bit as being applied
> to any valid Base Unit specification could cause problems if platform
> IPMI implementations were done that did not interpret the percent bit in
> exactly the way we are talking about it.
>
> -- Jim Mankovich | [email protected] --
>
>
> On 2/8/2012 11:01 AM, Albert Chu wrote:
>> Hi Jim,
>>
>> On Wed, 2012-02-08 at 08:37 -0800, Jim Mank wrote:
>>> All,
>>>
>>> I would like to start contributing to the ipmitool project and as a
>>> initial task I thought I would resolve the open bug associated with
>>> ipmitool's inability to display percentage units correctly
>>> (https://sourceforge.net/tracker/?func=detail&aid=3014014&group_id=95200&atid=610550).
>>> I'm currently working for Hewlett Packard in their Proliant server
>>> organization and I and others are starting to look at how we can better
>>> serve our customers by helping make ipmitool more robust. I only have
>>> access to HP Proliant servers, so I'll be doing my testing on various HP
>>> Proliant servers. I'm not very familiar with IPMI so I'll be learning
>>> as I work though problems, any and all help with IPMI would much
>>> appreciated.
>>>
>>> In investigating this problem, I found in the IPMI v2.0 spec that the
>>> percentage units are identified by bit 0 == 1 in byte 21 of the Full and
>>> Compact Sensor Records. In looking at the ipmitool code, the
>>> sdr_record_full_sensor and sdr_record_compact_sensor both properly
>>> declare the percentage bit (pct), but no code looks at this. So,
>>> display of percentage units correctly in the ipmitool requires correct
>>> interpretation of this bit in the sensor records. As I understand the
>>> spec, if the pct bit is set to one, then the units are a percentage and
>>> the Base Unit would be unspecified.
>> While this is the 99.9% case, I believe it is legal for the base unit to
>> be specified. Looking through the units list "% hit" and "% miss" seem
>> like reasonable base units to go with "%". There might be other
>> possibilities when you add the rate unit and modifier units (i.e. "% X /
>> Y" or "% X per Y").
>>
>> My code here is probably not perfect, but perhaps this can give you
>> hints on some of the corner cases that can be expected:
>>
>> http://svn.savannah.gnu.org/viewvc/trunk/libfreeipmi/util/ipmi-sensor-units-util.c?revision=8165&root=freeipmi&view=markup
>>
>> Al
>>
>>> The code for displaying units in the sensor records is replicated in
>>> multiple places in the code, each doing pretty much the exact same
>>> decoding. There does exist one function for decoding the units,
>>> ipmi_sdr_get_unit_string, so I've changed the code so this routine will
>>> be used for all units decoding and I updated this function to display a
>>> new unit named "percent".
>>>
>>> In doing these modifications, I'm wondering if it would be ok for me to
>>> to do some local variable cleanup in ipmi_sdr_print_sensor_full. I
>>> noticed that the local variable do_unit is set to one, but never
>>> changed, so could this code be removed?
>>>
>>> When I have these changes available, should I just send a patch to this
>>> email alias?
>>>
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