46 lines
1.6 KiB
Diff
46 lines
1.6 KiB
Diff
From ee8b8993d98b3f6af9c058194228fc534fcd0796 Mon Sep 17 00:00:00 2001
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From: Jan Friesse <jfriesse@redhat.com>
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Date: Mon, 7 Oct 2019 15:26:22 +0200
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Subject: [PATCH] totemsrp: Reduce MTU to left room second mcast
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Messages sent during recovery phase are encapsulated so such message has
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extra size of mcast structure. This is not so big problem for UDPU,
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because most of the switches are able to fragment and defragment packet
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but it is problem for knet, because totempg is using maximum packet size
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(65536 bytes) and when another header is added during retransmition,
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then packet is too large.
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Solution is to reduce mtu by 2 * sizeof (struct mcast).
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Signed-off-by: Jan Friesse <jfriesse@redhat.com>
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Reviewed-by: Fabio M. Di Nitto <fdinitto@redhat.com>
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---
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exec/totemsrp.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/exec/totemsrp.c b/exec/totemsrp.c
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index 548f1dc..0caded0 100644
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--- a/exec/totemsrp.c
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+++ b/exec/totemsrp.c
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@@ -803,7 +803,7 @@ static void totempg_mtu_changed(void *context, int net_mtu)
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{
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struct totemsrp_instance *instance = context;
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- instance->totem_config->net_mtu = net_mtu - sizeof (struct mcast);
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+ instance->totem_config->net_mtu = net_mtu - 2 * sizeof (struct mcast);
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log_printf (instance->totemsrp_log_level_debug,
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"Net MTU changed to %d, new value is %d",
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@@ -5112,7 +5112,7 @@ void main_iface_change_fn (
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}
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void totemsrp_net_mtu_adjust (struct totem_config *totem_config) {
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- totem_config->net_mtu -= sizeof (struct mcast);
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+ totem_config->net_mtu -= 2 * sizeof (struct mcast);
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}
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void totemsrp_service_ready_register (
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--
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1.8.3.1
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