You can change anything in OVS by modifying the source code, so this isn't really a surprise.
Buffers aren't very useful, so we've never made them adjustable, and OVS 2.7 removes them entirely. On Fri, Mar 17, 2017 at 10:21:49AM +0800, Big Strong wrote: > From the source code I found the way to modify n_buffers by adjusting the > PKTBUF_BITS. For example, I can set it to 1024 by setting PKTBUF_BITS to > 10. > Does the modification have any some side-effects? Why doesn't OVS make it > adjustable? > > /* Buffers are identified by a 32-bit opaque ID. We divide the ID > > * into a buffer number (low bits) and a cookie (high bits). The buffer > > number > > * is an index into an array of buffers. The cookie distinguishes between > > * different packets that have occupied a single buffer. Thus, the more > > * buffers we have, the lower-quality the cookie... */ > > #define PKTBUF_BITS 8 > > #define PKTBUF_MASK (PKTBUF_CNT - 1) > > #define PKTBUF_CNT (1u << PKTBUF_BITS) > > #define COOKIE_BITS (32 - PKTBUF_BITS) > > #define COOKIE_MAX ((1u << COOKIE_BITS) - 1) > > > 2017-03-16 23:07 GMT+08:00 Ben Pfaff <b...@ovn.org>: > > > OVS sends a packet to the controller if the flow table tells it to do > > so. There's nothing in OpenFlow that restricts this on the basis of a > > flow or a response from the controller. > > > > n_buffers is not adjustable. > > > > On Thu, Mar 16, 2017 at 10:22:38PM +0800, Big Strong wrote: > > > @Ben, does it mean ovs would repeatedly send packet in messages as long > > as > > > no response is got from controller? What will happen when a same packet > > > comes to ovs while the old packet in message is still not handled? > > > > > > Another question, is the n_buffers size adjustable using > > > ovs-ofctl/ovs-vsctl command? I want a larger n_buffers rather than the > > > default 256. > > > > > > Regards. > > > > > > 2017-03-16 4:54 GMT+08:00 Ben Pfaff <b...@ovn.org>: > > > > > > > On Wed, Mar 15, 2017 at 01:34:56PM +0800, yiyefuping198425 wrote: > > > > > I'm asking for assistance to fix this issue: ovs send many packets > > of a > > > > table miss flow instead of the first packet. > > > > > > > > That's how OpenFlow works. > > > > _______________________________________________ > > > > discuss mailing list > > > > disc...@openvswitch.org > > > > https://mail.openvswitch.org/mailman/listinfo/ovs-discuss > > > > > > _______________________________________________ discuss mailing list disc...@openvswitch.org https://mail.openvswitch.org/mailman/listinfo/ovs-discuss
