netdev - Re: [PATCH] cxgb3: Apply interrupt coalescing settings to all queues

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Date:	Mon, 28 Mar 2011 10:41:54 -0700
From:	Divy Le Ray <divy@...lsio.com>
To:	Anton Blanchard <anton@...ba.org>
CC:	netdev@...r.kernel.org
Subject: Re: [PATCH] cxgb3: Apply interrupt coalescing settings to all queues

On 03/27/2011 07:50 PM, Anton Blanchard wrote:
>
>
> While testing the performance of different receive interrupt
> coalescing settings on a single stream TCP benchmark, I noticed two
> very different results. With rx-usecs=50, most of the time a
> connection would hit 8280 Mbps but once in a while it would hit
> 9330 Mbps.
>
> It turns out we are only applying the interrupt coalescing settings
> to the first queue and whenever the rx hash would direct us onto
> that queue we ran faster.
>
> With this patch applied and rx-usecs=50, I get 9330 Mbps
> consistently.
>
> Signed-off-by: Anton Blanchard <anton@...ba.org>

Acked-by: Divy Le Ray <divy@...lsio.com>

> ---
>
> Index: powerpc.git/drivers/net/cxgb3/cxgb3_main.c
> ===================================================================
> --- powerpc.git.orig/drivers/net/cxgb3/cxgb3_main.c     2011-03-28 
> 12:36:41.775206214 +1100
> +++ powerpc.git/drivers/net/cxgb3/cxgb3_main.c  2011-03-28 
> 12:41:29.892189120 +1100
> @@ -1983,14 +1983,20 @@ static int set_coalesce(struct net_devic
>  {
>         struct port_info *pi = netdev_priv(dev);
>         struct adapter *adapter = pi->adapter;
> -       struct qset_params *qsp = &adapter->params.sge.qset[0];
> -       struct sge_qset *qs = &adapter->sge.qs[0];
> +       struct qset_params *qsp;
> +       struct sge_qset *qs;
> +       int i;
>
>         if (c->rx_coalesce_usecs * 10 > M_NEWTIMER)
>                 return -EINVAL;
>
> -       qsp->coalesce_usecs = c->rx_coalesce_usecs;
> -       t3_update_qset_coalesce(qs, qsp);
> +       for (i = 0; i < pi->nqsets; i++) {
> +               qsp = &adapter->params.sge.qset[i];
> +               qs = &adapter->sge.qs[i];
> +               qsp->coalesce_usecs = c->rx_coalesce_usecs;
> +               t3_update_qset_coalesce(qs, qsp);
> +       }
> +
>         return 0;
>  }
>
> --
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