The Convergence of Storage and Server Virtualization Solarflare Communications, Inc.

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1 The Convergence of Storage and Server Virtualization 2007 Solarflare Communications, Inc.

2 About Solarflare Communications Privately-held, fabless semiconductor company. Founded 2001 Top tier investors: Accel, Foundation, Intel Capital, Oak Headquartered in Irvine, California, R&D center in Cambridge, UK Expertise and leadership in Ethernet silicon and software Highest number of contributions to 10GBASE-T Std IEEE 802.3an First production ready, highest-performing 10GBASE-T PHY Lowest power, highest performance 10G controller Single unified 10G Ethernet Silicon and Software platform Slide Solarflare Communications, Inc.

3 Perspective on storage and server virtualization Manageability, Cost, Scalability Virtualization takes hold FibreChannel enabled storage virtualization (1990 s) VMware, XEN, Microsoft enable server virtualization (2000 s) CPU chipsets enable more efficient virtualization Virtualization challenges Application I/O demands increasing dramatically Virtual OS introduced new I/O bottlenecks Cost of supporting multiple networks Slide Solarflare Communications, Inc.

4 Industry solutions 10GBASE-T Enables high performance virtualization at low cost: Single, low cost, easy to use, network High-performance, converged I/O architecture Expect rapid reduction in price and power (enabling mass adoption) iscsi enables scalable storage on commodity hardware/software SCSI protocol over TCP iscsi products are today mature and stable 10GBASE-T provides great iscsi performance (> 1000MB/s) Storage virtualization and server virtualization are converging Slide Solarflare Communications, Inc.

5 Storage and Virtualization Architecture (SVA) API which supports acceleration of guest networking and advanced Virtual OS features migration hot-plug stateless offloads Also supports diverse optional hardware and accelerations Safe, direct hardware access from guest OS broadcast and multicast delivery acceleration local loopback PCI-IOV and ATS perfect or imperfect filtering While retaining the successful OEM/ISV/OS dynamic for the volume market Open and simple APIs permit innovation OS and Virtual OS competition and co-existence Slide Solarflare Communications, Inc.

6 I/O in Xen: the front-end and back-end All 'real' drivers live in Dom0 DomU kernels have pseudo drivers that communicate with Dom0 via the hypervisor Necessary because only Dom0 is 'trusted' Dom0 DomU DomU Hardware Hypervisor Slide Solarflare Communications, Inc.

7 I/O with SVA DomU can access hardware directly + safely Unprivileged guests can transmit and receive packets directly Bypassing Dom0 and hypervisor At least most of the time; still slow path via Dom0 Accelerated paths set up in Dom0 In order safely to restrict DomU s access Dom0 DomU DomU Hardware Hypervisor Slide Solarflare Communications, Inc.

8 SVA Network Performance Back to back SFE4003 A1 Reference design (CX4) (v ) Intel 5000X chipset, quad core 2.6 GHz Xeon GB RAM, 1500 byte MTU Aggregate throughput of 1-4 TCP streams (NetPerf), each in a separate Xen virtualised Linux guest. Direct hardware access increases bandwidth, reduces CPU overhead and eliminates the I/O bottleneck in the parent domain. Responsiveness of machine also significantly improved in the Solarflare Accelerated case. Slide Solarflare Communications, Inc.

9 Bidirectional performance U n a c c e l e r a t e d A c c e l e r a t e d guest 2 guests 3 guests 4 guests Slide Solarflare Communications, Inc.

10 Plug-in architecture Dom0 DomU Backend driver Plug-in Shared pages FIFOs Front-end driver Hardware dependent accelerated plug-in In shared pages: Virtual Interfaces FIFOs Tx/Rx buffs Local MAC tbls EvQ RxQ RxQTxQ TxQEvQ EvQ VI VI VI RxQ TxQ EvQ VI Slide Solarflare Communications, Inc.

11 Solarflare s SFC4000 Front-end driver in DomU Where possible, interacts with h/w directly This is known as fast path Otherwise packets routed via Dom0: slow path Need to be careful about Tx traffic for local machine Back-end driver lives in Dom0 Sets up Virtual Interface per guest VM Installs filters on-demand as traffic flows in/out Enforces quotas on front-end drivers Slide Solarflare Communications, Inc.

12 Migration On migration, back-end sends h/w unavailable message to front-end Everything then goes over slow-path Possibly followed by new h/w available message at the other end If no accelerated hardware available, or if no driver for that hardware available: slow path! Slide Solarflare Communications, Inc.

13 SVA and Storage (Consider 3 Options) iscsi initiator runs in Dom0 Dom0 DomU DomU iscsi initiator block i/f iscsi initiator runs in DomU iscsi initiator runs in DomU+ direct HW access Hardware Hypervisor Dom0 DomU DomU block i/f iscsi initiator Hardware Hypervisor Slide Solarflare Communications, Inc.

14 SVA Storage Performance Back to back SFE4003 A1 Reference design (CX4) (v ), Intel 5000X chipset, quad core 2.6 GHz Xeon GB RAM, 1500 byte MTU Aggregate throughput of 6 iscsi streams (Disktest 64KB Seq Read), each in a separate Xen virtualised Linux guest to Microsoft WUDSS iscsi target Direct hardware access increases bandwidth, reduces CPU overhead and eliminates the I/O bottleneck in the parent domain. Responsiveness of machine also significantly improved in the Solarflare Accelerated case. Slide Solarflare Communications, Inc.

15 iscsi in the guest? Why you want iscsi in the guest Potential for better performance Connections migrate with guest Less scheduling cross-talk Use existing iscsi tools Security: authorization per guest initiator Slide Solarflare Communications, Inc.

16 iscsi in the guest? and why you don t: Older guests may lack iscsi support Lots of different iscsi stacks (quirks, tools, etc) Boot device over iscsi much simpler from Dom0 Conclusion: No single best answer Likely hot-spot between OS and virtualized OS vendors Slide Solarflare Communications, Inc.

17 What's next for SVA and Xen? Submission of SFC4000 accelerated drivers to xendevel Framework already merged New features to integrate MAC filtering transmit MSI-X (interrupt line per guest) DMA to other guests on the same host PCI-IOV Slide Solarflare Communications, Inc.

18 Conclusions Smart I/O hardware can boost performance Also less QoS cross talk Negates the need for driver domains iscsi doesn t necessarily belong in Dom0 Converged storage and virtualization architectures High-performance, low-cost, easy to use Utilizing commodity hardware and driving consolidation Slide Solarflare Communications, Inc.

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