From: Andreas Hoefler <andreas.hoefler@ch.abb.com>
To: "linux-rt-users@vger.kernel.org" <linux-rt-users@vger.kernel.org>
Subject: FW: netdev_budget_usecs setting below 1 jiffie leads to run everything in ksoftirqd
Date: Mon, 9 Sep 2019 07:15:26 +0000 [thread overview]
Message-ID: <VI1PR06MB4462841C1BBE301CE41E17FECEB70@VI1PR06MB4462.eurprd06.prod.outlook.com> (raw)
In-Reply-To: <VI1PR06MB4462E7D2C5BDA4E8CF66D234CEB40@VI1PR06MB4462.eurprd06.prod.outlook.com>
Hi all
On 4.14.79-rt47 I have the issue, that when I check /proc/net/softnet_stat during receiving 4000 packets per second on the gmac (TI Sitara), the third column (nr of times it ran out of budget) counts up like crazy. The netdev_budget as well as the netdev_budget_usecs are left at default. Although as soon as I increase the netdev_budget_usecs to 10001 (HZ is 100), the counter stops.
As far as I know, the usecs_to_jiffies(netdev_budget_usecs) used for the time_limit in net_rx_action() will round up to one jiffie with my default setting, meaning 10ms or am I missing something here?
Thx
Andy
parent reply other threads:[~2019-09-09 7:15 UTC|newest]
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