Skunk Worx wrote:
Skunk Worx wrote:
Under 2.6.14, there was one or two of these 40 ms. calls out of 48,000
calls total. Under 2.6.15, we're seeing about 3,000 40 ms. of these
calls out of 48,000 calls total.
I am posting for completion. This performance hit was due to the new
2.6.15 "ABC" (Appropriate Byte Count) algorithm. There is an IETF RFC
for this, RFC3465.
The purpose is to decrease internet congestion, but it can have a
performance impact on poorly written network code (for example setting
TCP_NODELAY on sockets and sending packets with small payloads)
It is possible to disable this feature with sysctl of net.ipv4.tcp_abc.
In our case, all is well...we found a setting in the GSOAP toolkit that
restores the original performance...we're FC5 ready!
--
SW
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