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O =_<j?)The Performance of -Kernel-Based Systems"* " H. Hrtig, M. Hohmuth, J. Liedtke, S. Schnberg and J. Wolter Dresden U. and IBM TJ Watson Appears in SOSP 1997 Presented by: Fabin E. Bustamante l"$ " j           C   ZCustomizability Research in OSGoal Provide flexible mechanisms and policies to clients Different context  different goals for customization (perf., power consumption, conflicting client needs, & ) Design issues Performance  while sometimes introduced to improve perf., customizability mechanisms have a cost Spread  throughout the OS or just part of it (such as the scheduling policy) Granularity  all aspects of a policy or in some restricted manner (such as a menu of options scheduling policies) Integrity  clearly, level and complexity of what needs to be enforced is related to both granularity and spread Purpose  special- or general-purpose OS? Paradigm  a traditional, posix-like OS or something new (such as Scout data-paths)^PPPP  >pu5[Taxonomy~A high-level taxonomy*  criteria Initiator of adaptation Human admin or OS designer Application OS itself Time of adaptation Design, build or installation (static) Boot or run-time (dynamic)l"1B"1B  NHistorical ContexttKernel The mandatory part of an OS Can use all features of a processor Most early OS were monolithic Complete OS was packed into a single kernel (scheduling, file system, memory management,& ) Microkernel approach Minimize kernel, implementing servers on top Ideally, only ASs, IPC & basic scheduling is left insidev@[f@[ f(\Software Technology AdvantagesHDifferent APIs, FS, even different OS strategies can coexists Flexibility and extensibility Server malfunction is isolated, even device drivers Clean k i/f enforces a more modular system structure Smaller kernel is easier to maintain and less prone to error Smaller Trusted Computing Base (hw, k, disk drive and maybe the FS)  IZ O&First Generation & Evaluation CriteriaConceptual breakthrough to ks Mach s external pager  k manages physical and virtual memory; forwards page faults to user-level task Handling hardware interrupts as IPCs & include I/O ports into AS  k captures the interrupt but doesn t handle it (interrupt handling and device I/O done outside k) Appealing yes, but is it useful? Are the concept flexible & costs low enough? Critical mechanism for efficiency - IPC Stabilized in Mach 3  a Mach RPC 10x Conventional Unix Conclusion  the layer of abstraction provided by ks is either too low - look at extensible-kernel ideas, figure out how to protect kernels from misbehaved extensions (SPIN, Vino, etc) or too high  exterminate all abstractions; OS two jobs  protection (safely multiplex physical resources) and provide an abstract machine - forget the latter (exokernel)  N`@)" "N"` " @")""bb| _ ObservationhProblem is measurements The system you measure  legacy problem with 1st generation ks How you measure it and what conclusions you draw - is it the approach, the concepts implemented by a particular k or the implementation of the k? Evaluation criteria then Conservative criterion  applications must not be degraded by k - compatibility performance Progressive criterion - k must efficiently support new types of apps w/ good performance - extensibility performance Approach A monolithic Unix kernel, Linux, was adapted to run on top of L4 (as a user-level single server) Performance was compared to MkLinux, a third-party port of Linux to a Mach 3.0 derived k (first generation) Different application, generic and specific were implemented and evaluated Performance portability checked w/ an Alpha-port of L4 PPPP PQP"."*"" "  "Q",U yF L4 Essentials  Based on 2 basic concepts: Threads  An activity executing inside an AS AS  a mapping which associates each virtual page to a physical page frame Recursive construction of ASs By magic there s a one AS 0 k provides 3 operations Grant  owner of an AS can grant any page to another AS Map  owner can map any page into another AS, now both can access it Flush/demap/& - onwer can flush any of its pages w/o warning All AS are constructed and maintained by user-level servers  pagers Threads can dynamically associate individual pagers with themselves I/O ports are treated as parts of ASs Hardware interrupts are handled as IPC Pentium-specific  small-AS (<512MB) can be physically shared & protected by Pentium s segment mechanismPyPP6PPEPDPP"y"" " "*""E"D " $"$   `Linux on Top of L40No-tuned port of Linux 2.0 Goal  full binary compatibility Double page tables (inside the kernel for security, and in the Linux server for portability)PSource-code LinesRCompatibility PerformanceWhat s the penalty of using L4Linux instead of native Linux Run benchmarks on both in the same hardware Does the performance of the underlying k matter? Compare L4Linux to MkLinux, both in user-level and as an extensionf<,2C<,' " C")GMore Microbenchmark Results  aMacrobenchmarks&Compilation time for the Linux server ^More Macrobenchmarks VMore Macrobenchmarks KExtensibility PerformanceE.g. Application-level Pipes  shows that the pipe performance can be increased drastically when using a user-level pipe implementing using k facilities Linux  standard pipe provided by Linux, running native L4Linux  same on L4Linux w/ shared library L4 & app-level  runs on bare L4 Restricted  synchronous L4 RPC (blocking IPC w/o buffering)L""LExtensibility PerformancejCache partitioning Run a 64x64-matrix multiplication Interrupted by a synthetic load that maximizes cache conflicts Uninterrupted  10.9ms Interrupted every 100 microsec, worst-case 96.1 ms Using cache-partitioning, enabled by user-level pagers, allocating 3 secondary-cache pages (of 64)  worst-case 24.9ms 2"#b ConclusionL4Linux ~ native Linux  5-10% penalty Collocation on its own is not sufficient to fix performance problems What about L4 w/ collocation? Pipes and some VM operations used as examples of improve Unix-compatible functionality Real-time memory management example shows the advantage to coexisting systems based on other paradigms]General ConclusionsTApplying the performance criterion to such complex systems is complex  nave, uninterpreted measurements are sometimes misleading Early k measurement suggested reducing the IPC cost, but the real problem was the structure and implementation of kernels Although steady evolution is a powerful methodology, sometimes a radical approach is needed Most problems of 1st generation k were caused by their step-by-step developmentZ{Z\ZQZu \  (= O O/(   0` .T3f` T3f3f` 999MMM` lff3f3޲` eoHff33Ҷ` ff!` T3f3f___>?" dd@$?nPd@ d " @ ` n?" dd@   @@``PR   @ ` `(p>>  H@ (    s * "0@  T Click to edit Master title style! !  c $l "0j  RClick to edit Master text styles Second level Third level Fourth level Fifth level!     S  Nff??"?  Nff??"? F  "  Nff??"  Nff??"   Nff??"  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S &  dL4Linux, app-level Unix pipe @` p # l21 ?S   R 46microsec   @` p # l21 ? S  OL4Linux @` p # l21 ?S    QLatency @` p # lDC 1 ? S  PSystem @`B p Z1 ? S  B p Z1 ?kS kB p Z1 ?  B p Z1 ?y y B p Z1 ?S   B p Z1 ?  B p Z1 ? y B p Z1 ?y y B p Z1 ?  B  p Z1 ?y y B !p Z1 ? & B "p Z1 ?y y& B #p Z1 ?& kB $p Z1 ?y& ykB 'p Z1 ?S kkB (p Z1 ?kyk~F Ha  )p i B *p  `D1?B +p  `D1?`H`a H p 0޽h ? T3f3f___80___PPT10.9XX$  0 t$(  tr t S XC 0@  C  r t S C 0j C  H t 0޽h ? T3f3f___80___PPT10.9^$  0 ` $(  r  S $%C 0@  C  r  S %C 0j C  H  0޽h ? T3f3f___80___PPT10.:eb$  0  $(  r  S *C 0@  C  r  S +C 0j C  H  0޽h ? T3f3f___80___PPT10.:ōF 0 P0X(  0p 0 0 ?@K   C  0 BwC   PE  C   B 0 s *޽h ? ̙33r&c( GNwZjiyX~  g,}lnoR ,ِ9& ?1Oh+'0Ux   , 8 D P\dWelcomeDistributed SystemsFabian E. Bustamante AquaLab05Fabian E. Bustamante58Microsoft PowerPoint@ ^@}@ OQ@`#:4GSg  )'    """)))UUUMMMBBB999|PP3f333f3333f3ffffff3f̙3ff333f333333333f33333333f33f3ff3f3f3f3333f33̙33333f333333f3333f3ffffff3f33ff3f3f3f3fff3ffffffffff3ffff̙fff3fffff3fff333f3f3ff3ff33f̙̙3̙ff̙̙̙3f̙3f333f3333f3ffffff3f̙3f3f3f333f3333f3ffffff3f̙3f3ffffffffff!___wwwSett4'A x(xKʦ """)))UUUMMMBBB999|PP3f3333f333ff3fffff3f3f̙f3333f3333333333f3333333f3f33ff3f3f3f3333f3333333f3̙33333f333ff3ffffff3f33f3ff3f3f3ffff3fffffffff3fffffff3f̙ffff3ff333f3ff33fff33f3ff̙3f3f3333f333ff3fffff̙̙3̙f̙̙̙3f̙3f3f3333f333ff3fffff3f3f̙3ffffffffff!___wwweeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeϮϮϮϮϮϮϮϮϮϮϮϮϮϮϮϮϮϮϮϮ՜.+,0    On-screen ShowEast Texas Data Service/ Times New RomanTahomaArial WingdingsVerdana Helvetica aqualab01*The Performance of -Kernel-Based SystemsCustomizability Research in OS TaxonomyHistorical ContextSoftware Technology Advantages'First Generation & Evaluation Criteria ObservationL4 EssentialsLinux on Top of L4Source-code LinesCompatibility PerformanceMore Microbenchmark ResultsMacrobenchmarksMore MacrobenchmarksMore MacrobenchmarksExtensibility PerformanceExtensibility Performance ConclusionGeneral Conclusions  Fonts UsedDesign Template Slide Titles,_$0Fabian E. BustamanteFabian E. Bustamante  !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~      !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~Root EntrydO)PicturesnCurrent UserSummaryInformation(DUPowerPoint Document(HDocumentSummaryInformation8