Tech talk network - friend or foe
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- TCP was originally designed with a goal of allowing communication networks to withstand nuclear war through a loose network of interconnected nodes with ad-hoc routing and weak service guarantees. - While TCP works well for high reliability and in-order delivery over high-latency wide-area networks, it is not optimized for high-performance computing clusters with low-latency infiniband or 10 gigabit ethernet networks. - Alternatives like TCMP and SCTP were designed for low-latency clustered environments and provide features like message-orientation, multi-streaming, and multi-homing that simplify congestion control compared to TCP.
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- Mainframe computers offer high-speed processing and large storage and are used as central databases and host systems.
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みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
ここ3000字までしか入らないけどタイトルの方がたくさん文字入ると思います。
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みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
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Cosa hanno in comune un mattoncino Lego e la backdoor XZ?
Cosa hanno in comune un mattoncino Lego e la backdoor XZ?
Tech talk network - friend or foe
- 1. Network - friend or foe
- 2. Session outline • Good old TCP design goals, tuning, caveats • Network congestion • LAN vs. WAN • Alternatives to TCP TCMP – cluster transport in Coherence SCTP • Death detection • Multicast
- 3. TCP/IP origins Main design goal – communication infrastructure resistive to effects of thermonuclear war. • Loose network of interconnected nodes • Ad-hoc routing decisions • Very weak service guaranties
- 4. TCP’s little dirty secrets High latency networks • SO_RCVBUF – caps connection bandwidth Nagel’s algorithm – 200ms delay • Use TCP_ NODELAY • Does not affect localhost connections Firewalls • Silent connection drops
- 6. TCP summary • Thermonuclear resistance approach Cowardly in bandwidth utilization Vulnerable to random packet drops • No messages • Head of line syndrome • No multi homing
- 7. Reality of HPC clusters • In order frame delivery • Infiniband / 10GiE – link level flow control • Low latency • No slow start needed • Congestion control cloud be drastically simplified
- 8. UDP based transport • No flow control – much large receive buffer required to avoid losses on receiver side (e.g. sysctl -w net.core.rmem_max) – congestion prevention should be implemented
- 9. TCMP (Oracle Coherence) • UDP based protocol • Exploit ordered delivery for fast NACK • Fast NACK -> very fast congestion detection • Extra logic to account for JVM specific behavior
- 10. Peer death detection – essential part of any distributed algorithms
- 11. Peer death detection Response timeouts are bad detector Temporary network outages change of route, congestion, etc Temporary application outages GC, swapping, server CPU starvation Positive loopback effect “Corrupted witness” syndrome
- 12. Peer death detection Ingredients of good death detection: • Process death detection using TCP • Monitor remote OS liveliness not just peer • Multiple witness suspect protocol
- 13. SCTP SCTP – L4 protocol, TCP replacement • Works over IP or SS7 • Message oriented • Multi stream delivery • Multi homing • Fast networks and jumbo frames in mind
- 14. Multicast Group multicast • Suitable for group communication • Not support in network hardware AFAIK Hub and spoke multicast • Replicating large amounts of data • Video broadcasting • PIM/IGMP (IGMP spoofing HW support)
- 15. IGMP multicast
- 16. THANK YOU alexey.ragozin@gmail.com