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:	Wed, 27 Aug 2014 15:56:51 +0200
From:	Jesper Dangaard Brouer <>
To:	Eric Dumazet <>
Cc:	Hannes Frederic Sowa <>,
	David Miller <>,,,,,,,,
Subject: Re: [PATCH 0/2] Get rid of ndo_xmit_flush

On Wed, 27 Aug 2014 06:23:58 -0700
Eric Dumazet <> wrote:

> I am afraid Jesper tests are not complete to truly have a picture of the
> extra costs, because he made sure no false sharing was possible (A
> single cpu does everything and keeps skb in its cache)

I fully agree. My tests a very artificial benchmarks only for the
optimal case.

I do worry a bit, if writing skb->xmit_more in a more cache cold
scenarios could hurt us (as that cacheline seems to be read mostly),
but this is not a problem right now because it will always be cache
hot, as we always clear the entire SKB in alloc.

Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Sr. Network Kernel Developer at Red Hat
  Author of
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to
More majordomo info at

Powered by blists - more mailing lists