[lkml]   [2012]   [Jun]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] virtio-net: fix a race on 32bit arches
On Wed, 6 Jun 2012 17:49:42 +0300
"Michael S. Tsirkin" <> wrote:

> Sounds good, but I have a question: this realies on counters
> being atomic on 64 bit.
> Would not it be better to always use a seqlock even on 64 bit?
> This way counters would actually be correct and in sync.
> As it is if we want e.g. average packet size,
> we can not rely e.g. on it being bytes/packets.

This has not been a requirement on real physical devices; therefore
the added overhead is not really justified.

Many network cards use counters in hardware to count packets/bytes
and there is no expectation of atomic access there.

 \ /
  Last update: 2012-06-06 20:41    [W:0.099 / U:5.232 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site