Ondřej
By the way, have you ever considered using Redis as an in-memory
cache database? I’ve been thinking about offloading some of the TTL
expiry and cache management to Redis.
In some customer environments, the query volume is extremely high —
we’re using Mellanox CX-6 25G interfaces, which already handle a lot
of offloading and fair IRQ distribution at the NIC level — so I
wonder if you ever ran into performance limitations with Redis under
similar loads, or decided against it for architectural reasons.
Just curious....
Thank you
Carlos Horowicz
Planisys
On 02/07/2025 06:53, Ondřej Surý wrote:
On 2. 7. 2025, at 0:14, OwN-3m-All<own3m...@gmail.com> wrote:
I wonder if other memory issues users are complaining about are related.
I don’t know. You were the first one to actually provided a reproducer and a
usable test case. Despite your exaggeration about “countless” reports there
were not that many of them actually.
How many zones can a bind instance handle realistically?
Internally, we are testing BIND 9 with 1M small zones and it works just fine.
What happened was that 9.20 introduced a new database backend called QP that
replaced venerable custom red-black tree implementation we had. The side effect
of that was 12K memory chunk overhead per zone. Under normal conditions, this
would not manifest as that 12K would get filled with the zone data, but in the
case of almost empty zone, the memory chunk would be mostly empty and it just
blew up the memory requirements.
BIND 9.22 will contain an optimization that gradually increases the memory
chunk size and that allows “auto tuning” for both small zones, large zones and
the cache.
Ondrej
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Ondřej Surý — ISC (He/Him)
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