Date: Mon, 04 Jul 2011 11:30:51 +0300 From: Adrian Minta <gygy@stsnet.ro> To: Eugene Grosbein <egrosbein@rdtc.ru> Cc: freebsd-net@freebsd.org Subject: Re: FreeBSD 8.2 and MPD5 stability issues - update Message-ID: <4E117A3B.4070400@stsnet.ro> In-Reply-To: <4E10C97C.2030200@rdtc.ru> References: <f9d8cfb9ee20ba5ab730820fc5c45962.squirrel@mail.stsnet.ro> <4E10C8F3.2050006@rdtc.ru> <4E10C97C.2030200@rdtc.ru>
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On 07/03/2011 10:56 PM, Eugene Grosbein wrote:
>>
>> There is internal queue of messages in the mpd-5.5 with length 8129.
>> Messages are generated based on various events and enqueued there, then processed.
>>
>> Mpd uses GRED algorithm to prevent overload: it accepts all new L2TP connections
>> when queue has 10 or less slots occupied (unprocessed events).
>>
>> It drops all connections then it has over 60 slots occupied.
> s/all/new incoming/
>
>> In between, it drops new message with probability equal to (q-10)*2 percents
> s/message/L2TP connection/
>
>> where q is number of occupied queue slots. These constants are hardcoded in its src/ppp.h
>>
>> Each time it decided to ignore incoming L2TP requests it notes that in the log,
>> as you have already seen.
> Eugene Grosbein
>
>
Hi Eugene,
if I undestand corectly, in order to increase the connection rate I need
to replace 60 with 600 and 10 with 100 like this:
#define SETOVERLOAD(q) do { \
int t = (q); \
if (t > 600) { \
gOverload = 100; \
} else if (t > 100) { \
gOverload = (t - 100) * 2; \
} else { \
gOverload = 0; \
} \
} while (0)
Is this enough, or I need to modify something else ?
--
Best regards,
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