From: Sven Eckelmann <sven@narfation.org>
To: jens <jens@viisauksena.de>
Cc: b.a.t.m.a.n@lists.open-mesh.org
Subject: Re: [B.A.T.M.A.N.] limit of if per batman
Date: Wed, 25 Jan 2017 08:15:52 +0100 [thread overview]
Message-ID: <2528254.P9avF0yZu7@bentobox> (raw)
In-Reply-To: <ba5c036e-e34b-2b43-4df2-bc1c8883eedd@viisauksena.de>
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On Mittwoch, 25. Januar 2017 03:18:10 CET jens wrote:
> On 24.01.2017 14:39, Sven Eckelmann wrote:
> > There is no artificial limit added by batman-adv. But transmitting a lot of
> > broadcasts over 255 virtual links sharing the same physical link
> > might get interesting (independent of batman-adv).
>
> this made me curious , and i modified your script a bit - turns out
> after the 127. IF you add to batman-adv you get an Error -
> all 510 gretap links was succesfully build ...
> # ifconfig |grep gre| wc -l
> 515
> # batctl if|sort|wc -l
> 127
> the error is mainly
> *Error - can't write to file
> '/sys/class/net/gre128/batman_adv/mesh_iface': Cannot allocate memory
[...]
> [113990.684947] [<ffffffff8107c16e>] ? __warn+0xbe/0xe0 [113990.684955]
> [<ffffffffc017a804>] ? batadv_orig_hash_add_if+0x94/0x140 [batman_adv]
> [113990.684961] [<ffffffff811a7b10>] ? kmalloc_slab+0x90/0xa0
> [113990.684966] [<ffffffff811e08c5>] ? __kmalloc+0x25/0x580
> [113990.684971] [<ffffffff815ef9d7>] ? _raw_spin_lock_irqsave+0x17/0x39
> [113990.684977] [<ffffffff81432c11>] ? _crng_backtrack_protect+0x31/0x70
> [113990.684981] [<ffffffff811e0ebc>] ? kmem_cache_alloc_trace+0x9c/0x540
> [113990.684986] [<ffffffff814340b7>] ? get_random_bytes+0xe7/0x1c0
> [113990.684991] [<ffffffffc017a804>] ?
[...]
I would guess that your system mostly fails becauseit cannot handle the
allocation of the "large" arrays which store:
* @bcast_own: set of bitfields (one per hard-interface) where each one counts
* the number of our OGMs this orig_node rebroadcasted "back" to us (relative
* to last_real_seqno). Every bitfield is BATADV_TQ_LOCAL_WINDOW_SIZE bits long.
* @bcast_own_sum: sum of bcast_own
Kind regards,
Sven
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next prev parent reply other threads:[~2017-01-25 7:15 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-23 17:26 [B.A.T.M.A.N.] limit of if per batman jens
2017-01-24 13:39 ` Sven Eckelmann
2017-01-25 2:21 ` jens
2017-01-25 3:02 ` Andrew Lunn
[not found] ` <ba5c036e-e34b-2b43-4df2-bc1c8883eedd@viisauksena.de>
2017-01-25 7:15 ` Sven Eckelmann [this message]
2017-12-26 14:19 ` Sven Eckelmann
2018-01-23 12:33 ` Sven Eckelmann
2018-02-03 7:41 ` Sven Eckelmann
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