netdev - RE: [PATCH net-next] cxgb4: Reduce resource allocation in kdump kernel

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Message-ID: <CO2PR11MB008805A31B3921BF3C728F7A975A0@CO2PR11MB0088.namprd11.prod.outlook.com>
Date:	Sat, 4 Jun 2016 13:24:43 +0000
From:	Yuval Mintz <Yuval.Mintz@...gic.com>
To:	Casey Leedom <leedom@...lsio.com>,
	Hariprasad S <hariprasad@...lsio.com>,
	David Miller <davem@...emloft.net>
CC:	netdev <netdev@...r.kernel.org>,
	Nirranjan Kirubaharan <nirranjan@...lsio.com>
Subject: RE: [PATCH net-next] cxgb4: Reduce resource allocation in kdump
 kernel

> When is_kdump_kernel() is true, reduce our memory footprint by only using a
> single "Queue Set" and Forcing Master so we can reinitialize the Firmware/Chip.
> 
> Signed-off-by: Hariprasad Shenai <hariprasad@...lsio.com>
...
>         if (q10g > netif_get_num_default_rss_queues())
>                 q10g = netif_get_num_default_rss_queues();
> 
> +       /* Reduce memory usage in kdump environment by using only one queue
> +        * and disable all offload.
> +        */
> +       if (is_kdump_kernel()) {
> +               q10g = 1;
> +               adap->params.offload = 0;
> +       }
> +

Sounds like a common issue that might interest other devices as well.
Perhaps we should change netif_get_num_default_rss_queues() to return 1
when called from a kdump kernel?