Hello,
Apologies for late response.
Evgeniy Polyakov wrote:
Hi.
On Fri, Sep 21, 2007 at 09:18:07PM +0900, Satoshi OSHIMA ([EMAIL PROTECTED])
wrote:
This patch set try to introduce memory usage accounting for
UDP(currently ipv4 only).
Currently, memory usage of UDP can be observed as the sam of
usage of tx_queue and rx_queue. But I believe that the system
wide accounting is usefull when heavy loaded condition.
In the next step, I would like to add memory usage quota
for UDP to avoid unlimited memory consumption problem
under DDOS attack.
Could you please desribed such attack in more details?
Each UDP socket has its queue length which can not be exceeded
(roughly), no new sockets are created when remote side sends a packet
(like after special steps in TCP), so where is possibility to eat all
the mem?
I think Satoshi will answer this question soon.
This patch set is for 2.6.23-rc7.
I seriously doubt you want to put udp specific hacks and zillions of
atomic ops all around the code just to know exact number of bytes eaten
for UDP.
I'll revise the patch to reduce the number of atomic operations.
Please use udp specific code (like udp_sendmsg()) for proper accounting
if you need that, but not hacks in generic ip code.
As far as I know, Satoshi is improving this part right now. Please wait his
response.
Many thanks for your comments.
Best regards,
Hideo Aoki
--
Hitachi Computer Products (America) Inc.
-
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
