netdev - Re: cxgb3: Replace LRO with GRO

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Message-ID: <20090118225040.GA30418@gondor.apana.org.au>
Date:	Mon, 19 Jan 2009 09:50:40 +1100
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Divy Le Ray <divy@...lsio.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	Steve Wise <swise@...ngridcomputing.com>
Subject: Re: cxgb3: Replace LRO with GRO

On Sun, Jan 18, 2009 at 12:33:42PM -0800, Divy Le Ray wrote:
> 
> Thanks for the patch. It does improve the performance.
> I'm now getting about 5.3Gbs.

Thanks for testing Divy!

> Here is a oprofile output:
>       33.929900  copy_user_generic_unrolled          vmlinux
>        7.150300  process_responses                  cxgb3.ko
>        6.261100  refill_fl                          cxgb3.ko
>        6.181700  memcpy                              vmlinux

I wonder why this is still up there.

Maybe this patch will help?

diff --git a/net/core/dev.c b/net/core/dev.c
index 3742397..3cc19fa 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2554,7 +2554,8 @@ struct sk_buff *napi_fraginfo_skb(struct napi_struct *napi,
 
 	BUG_ON(info->nr_frags > MAX_SKB_FRAGS);
 	skb_shinfo(skb)->nr_frags = info->nr_frags;
-	memcpy(skb_shinfo(skb)->frags, info->frags, sizeof(info->frags));
+	memcpy(skb_shinfo(skb)->frags, info->frags,
+	       info->nr_frags * sizeof(*info->frags));
 
 	skb->data_len = info->len;
 	skb->len += info->len;

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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