On Wed, Jun 26, 2019 at 09:18:12PM +0800, txfh2007 via discuss wrote:
> I have a question about ovs fdb entry size && aging time. I have found the
> max fdb entry size is hard coded in mac_learning.c, that max_entries is 100k,
> the longest aging time is 3600s.
>
> But in my test environment on which pkt forwarding is based on OVS normal
> action, and my test center could generate about 200k flow simultaneously. So
> the performance is effected by max entry size（there shoud be fdb entries
> evicted by new pkts）, So can we enlarge the max_entries limitation, and what
> is the side effect?
It looks to me like the maximum is 1 million:
/* Sets the maximum number of entries in 'ml' to 'max_entries', adjusting it
* to be within a reasonable range. */
void
mac_learning_set_max_entries(struct mac_learning *ml, size_t max_entries)
{
ml->max_entries = (max_entries < 10 ? 10
: max_entries > 1000 * 1000 ? 1000 * 1000
: max_entries);
}
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