netdev - RE: [net-next v2 08/15] ixgbevf: compare total_rx_packets and budget in ixgbevf_clean_rx

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 21 Nov 2014 11:07:49 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Jeff Kirsher' <jeffrey.t.kirsher@...el.com>,
	"davem@...emloft.net" <davem@...emloft.net>
CC:	Emil Tantilov <emil.s.tantilov@...el.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"nhorman@...hat.com" <nhorman@...hat.com>,
	"sassmann@...hat.com" <sassmann@...hat.com>,
	"jogreene@...hat.com" <jogreene@...hat.com>,
	Alexander Duyck <alexander.h.duyck@...hat.com>
Subject: RE: [net-next v2 08/15] ixgbevf: compare total_rx_packets and
 budget in ixgbevf_clean_rx_irq

From: Jeff Kirsher
> From: Emil Tantilov <emil.s.tantilov@...el.com>
> 
> total_rx_packets is the number of packets we had cleaned, and budget is
> the total number of packets that we could clean per poll. Instead of
> altering both of these values we can save ourselves one write to memory by
> just comparing total_rx_packets to the budget and as long as we are less
> than budget we continue cleaning.
> 
> Also change the do{}while logic to while{} in order to avoid processing
> packets when budget is 0.

Does it matter if one packet is processed when budget is zero?
The 'do {} while ();' version will generate better code.

	David
 


--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html