netdev - Re: [PATCH] [-MM, FIX V3] e1000e: incorporate napi

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Date:	Sat, 8 Sep 2007 09:53:49 +0200
From:	Robert Olsson <Robert.Olsson@...a.slu.se>
To:	"Kok, Auke" <auke-jan.h.kok@...el.com>
Cc:	davem@...emloft.net, akpm@...ux-foundation.org, jeff@...zik.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH] [-MM, FIX V3] e1000e: incorporate napi_struct changes
 from net-2.6.24.git


Kok, Auke writes:

> david,
 > 
 > while testing this patch I noticed that the poll routine is now called 
 > 100% of the time, and since I'm not doing much different than before, I 
 > suspec that something in the new napi code is staying in polling mode 
 > forever? Since e1000e is pretty much the same code as e1000, I doubt the 
 > problem is there, but you can probably tell better. ideas?

 Hello,
 
 Yes a correct observation. I've spotted this bug too and it caused by the 
 policy change in the NAPI scheduling. Look at tx_cleaned. 


 I suggest we revert this change for now.
 

 Cheers
					--ro


Signed-off-by: Robert Olsson <robert.olsson@....uu.se>


 diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index 7b0bcdb..5cb883a 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -3944,7 +3944,7 @@ e1000_clean(struct napi_struct *napi, int budget)
 	                  &work_done, budget);
 
 	/* If no Tx and not enough Rx work done, exit the polling mode */
-	if ((tx_cleaned && (work_done < budget)) ||
+	if ((!tx_cleaned && (work_done == 0)) ||
 	   !netif_running(poll_dev)) {
 quit_polling:
 		if (likely(adapter->itr_setting & 3))




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