This is a note to let you know that I've just added the patch titled
net: set the minimum for net_hotdata.netdev_budget_usecs
to the 6.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-set-the-minimum-for-net_hotdata.netdev_budget_us.patch
and it can be found in the queue-6.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 62486f1fe10ccf2ce53af3d2dc0bba289b8d8dab
Author: Jiri Slaby (SUSE) <jirislaby@xxxxxxxxxx>
Date: Thu Feb 20 12:07:52 2025 +0100
net: set the minimum for net_hotdata.netdev_budget_usecs
[ Upstream commit c180188ec02281126045414e90d08422a80f75b4 ]
Commit 7acf8a1e8a28 ("Replace 2 jiffies with sysctl netdev_budget_usecs
to enable softirq tuning") added a possibility to set
net_hotdata.netdev_budget_usecs, but added no lower bound checking.
Commit a4837980fd9f ("net: revert default NAPI poll timeout to 2 jiffies")
made the *initial* value HZ-dependent, so the initial value is at least
2 jiffies even for lower HZ values (2 ms for 1000 Hz, 8ms for 250 Hz, 20
ms for 100 Hz).
But a user still can set improper values by a sysctl. Set .extra1
(the lower bound) for net_hotdata.netdev_budget_usecs to the same value
as in the latter commit. That is to 2 jiffies.
Fixes: a4837980fd9f ("net: revert default NAPI poll timeout to 2 jiffies")
Fixes: 7acf8a1e8a28 ("Replace 2 jiffies with sysctl netdev_budget_usecs to enable softirq tuning")
Signed-off-by: Jiri Slaby (SUSE) <jirislaby@xxxxxxxxxx>
Cc: Dmitry Yakunin <zeil@xxxxxxxxxxxxxx>
Cc: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx>
Link: https://patch.msgid.link/20250220110752.137639-1-jirislaby@xxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c
index 5dd54a8133980..47e2743ffe228 100644
--- a/net/core/sysctl_net_core.c
+++ b/net/core/sysctl_net_core.c
@@ -34,6 +34,7 @@ static int min_sndbuf = SOCK_MIN_SNDBUF;
static int min_rcvbuf = SOCK_MIN_RCVBUF;
static int max_skb_frags = MAX_SKB_FRAGS;
static int min_mem_pcpu_rsv = SK_MEMORY_PCPU_RESERVE;
+static int netdev_budget_usecs_min = 2 * USEC_PER_SEC / HZ;
static int net_msg_warn; /* Unused, but still a sysctl */
@@ -580,7 +581,7 @@ static struct ctl_table net_core_table[] = {
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
+ .extra1 = &netdev_budget_usecs_min,
},
{
.procname = "fb_tunnels_only_for_init_net",
