l4-hackers

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2827 discussions

performance of L4Linux
by Igor Shmukler 28 Oct '02

28 Oct '02

I read paper comparing performance of L4Linux of MkLinux (atop OSFMK) on x86 computer. Results are very interesting. I would really like to conduct benchmarks on my own. I know where to download Linux and L4Linux, but not the MkLinux for Intel. Does anyone still have binaries? If you do, please let me know how I could get these. Thank you, IS.

4 8

Local IPC identifier
by Jacob Gorm Hansen 25 Oct '02

25 Oct '02

hi, For some purposes when sending ipc to other threads in my task space, I find the need to explicitly state a taskid problematic. This information is redundant, and redundancy _always_ leads to problems. For me, the problem occurs when I move the l4linux server to a new task number, and another l4linux runs with my old number. All my threads get confused, and there is little I can do to help them (not without C&C at least, but that would still force me to use a taller task hierachy than I would like). What I need is something like 'if partner.id.task==0 then partner.id.task=current.id.task' in the kernel, and I suppose I will make such a hack myself. Is this what the rumoured 'lipc' feature in Pistachio is all about? Or is such a feature already present? thanks, Jacob

3 3

Lack of C&C redirection?
by Jacob Gorm Hansen 24 Oct '02

24 Oct '02

Hi, the Fiasco website says that nobody ever implemented C&C redirection for L4. Is this planned? What will happen in the current version, if I try to ipc to a task outside my clan? Best, Jacob

3 4

crt0.S and C++
by Alexey Mandrookin 15 Oct '02

15 Oct '02

Hi, Could anybody help me with crt0.S? I have project, which tightly related to L4. Project written in C++ and use abstract classes. The crt0.S was taken from FIASCO L4 examples and works well with C code. Unfortunately, it does not work with C++ code. Calling constructors for global objects does not work. Program crashed when abstract classes or virtual functions are used. It seems, virtual tables is not initialized. Guess a __static_initialization_and_destruction_0 function was not called. Does anybody have a C++ compatible crt0.S? Alexei

2 1

Native OS
by Alexey Mandrookin 09 Oct '02

09 Oct '02

Hi, does anybody interested in native OS implementation on top of a L4 microkernel? Perhaps I can donate a console driver within October. Alexei

5 7

Re: Native OS
by Frederic BOYER 09 Oct '02

09 Oct '02

I am interessed by a such project. In the past, I planed to write an Unix like on top of L4 in Ada. The goal was to port the GNAT Ada Run-Time on top of L4 and then write all the servers needed to make a good O.S. My new job take me a LOT of time, but I plan to realise this a futur day. Regards, Frédéric. "Alexey Mandrookin" <alman(a)mgateinc.com>@os.inf.tu-dresden.de on 09/10/2002 04:38:26 Sent by: l4-hackers-admin(a)os.inf.tu-dresden.de To: <l4-hackers(a)os.inf.tu-dresden.de> cc: (bcc: Frederic BOYER/PARIS/CAI-Cheuvreux) Subject: Native OS Hi, does anybody interested in native OS implementation on top of a L4 microkernel? Perhaps I can donate a console driver within October. Alexei _______________________________________________ l4-hackers mailing list l4-hackers(a)os.inf.tu-dresden.de http://os.inf.tu-dresden.de/mailman/listinfo/l4-hackers "This message, including any attachments may contain confidential and privileged material; it is intended only for the person to whom it is addressed. Its contents do not constitute a commitment by Crédit Agricole Indosuez Cheuvreux except where provided for in a written agreement. Crédit Agricole Indosuez Cheuvreux assumes no liability or responsibility for the consequences arising out of a delay and/or loss in transit of this message, or for corruption or other error(s) arising in its transmission and for any misuse or fraudulent use which may be made thereof. If you are not the intended recipient, please contact us and abstain from any disclosure, use or dissemination. To the extent that this message contains research information and/or recommendations, these are provided on the same basis as Crédit Agricole Indosuez Cheuvreux's published research and the recipient must have regard to all disclosures and disclaimers contained therein."

1 0

Pistachio
by Thomas Quintana 07 Oct '02

07 Oct '02

Hi, I was wondering what the time frame for the Pistachio micro-kernel looks like cuz i'm really interested in working on a multiserver project (ex. sawmill) under the v. 4 spec. the performance gains should be outstanding and good enough to compete against most monolithic kernels (not that the hazelnut kernel doesn't give them a run for their money). If any help is needed in the development pls post cvs and a todo list. thx, Thomas --------------------------------- Do you Yahoo!? Faith Hill - Exclusive Performances, Videos, & more faith.yahoo.com

1 0

Purpose of ping-pong in l4linux
by Jacob Gorm Hansen 02 Oct '02

02 Oct '02

hi, what is the purpose of the ping-pong task in l4linux? I can see that it handles vmalloc requests for the kernel, but why does it need its own task for this? thanks, Jacob

3 7

Tuning L4Linux on Fiasco
by Jacob Gorm Hansen 01 Oct '02

01 Oct '02

hi, the original l4linux papers mention performance about 4% lower than native linux. When running l4linux on top of Fiasco, performance seems to be more like 50% of what we get with native 2.2. For example, encoding a .wav-file to ogg-vorbis takes 2 minutes native, and almost 4 minutes with l4linux. LMBench also gives way-different figures. Is there anything we can do to tune Fiasco for better performance? Are other people experiencing the same speed differences as we are? Best regards, Jacob

2 3

Bugreport
by Alexey Mandrookin 24 Sep '02

24 Sep '02

Hi! I found strange behaviour of l4_i386_ipc_wait(). In case of interrupt IPC, it return wrong value of the thread id of IPC source. *** Version $gcc -v Reading specs from /usr/lib/gcc-lib/i686-pc-linux-gnu/2.95.3/specs gcc version 2.95.3 20010315 (release) $as -v GNU assembler version 2.11 (i686-pc-linux-gnu) using BFD version 2.11 $ld -v GNU ld version 2.11 (with BFD 2.11) *** UUencoded source code begin 644 test.tar.gz M'XL(`-=5CCT``^U:67/;1A+V*Z;*_V%B20XIDR!(4Y:+BE/10<M:4\>*<C;> MV(L"@:&("`<#@#KBTO[V_7IP\U!<J;6=![1*)&:FIZ>[IZ>/`<T@TM3AHR\* M6EO37G2[CS1-:V]O:<5O@N?MYYU'VO96]WFWLZUUM@A_^_F+1US[LFS%,`LC M(^#\D2-NC8?Q1!!^#8:^+JQ98FQ[@NOZ[G#8/]X;O-=UMF9[IC.S!/_!Z;9, MWYW:C@C4R8],88H:B=N(L?[)Q?G[FJZ;0:1;,]>]T_5ZVDD:C=)6TE`<83@* M&N958T.$4Z:8AN,HP_?'>Z<#_63WN%]S#=L#8B`*Y).^UB;?!SJG_TO''QD. 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M]<6-(8M.UH$G09YB81?DU'M62$G1(U_',=9J\=0'Y"8,"YWK+YKN,MEDB?XT MF0">,\_P=>1*3/0\QK"(<_6#]R$:^K/`%'SC5MVXY:CE0[H8CX]Y*AS,C:RO MV$[,K]B5S-6A'[EJNN*'Z`TTTQM`;3#Z7WKTP<^E8'SCE^(ZB1(;966G@4!- M'.\<\3,C,-RV),WE<R=^SN\BXD5X[.<;^0`Q38XZR:2D3>+XX9,:(QPN.''S M2KX(MBFD7<[L<,)'(KH1PN-TX20O4\C7EJY7U)1&`&DB?F/<T5MF^IV.$8AT MCZSL7D1>DFAJ)YGTSL-YB68(H,*YHU<3EB]">?-!B2>0I/M&%G*C\5=90)B/ MD7$FJDA$OKSJJ?,L;2`W432V>R[?1*>6EL?\>.'"4@\125]&XVDA8UE=EE)T M+A2"Z0LI^MG%KWE)_)$2$!K>E"-3JBJ>KL!%D?Z13F46\^4O3U*+6(C\)(=[ MIT\#09JBVRUJH30(=N82@'+\3S,E:*A4%20)B]RGSRP_'J@^2M8@S_>J,D3& MDV)^03JOK4@H_BP=H+ES6<"R!"`)^8@323!#3I,&["F=3D$_KTCB6.P@\VQ( M*6J=Q\'VY.?=P1$2A8-DF+9A<:BPA;JX11BY#*4Y9I<VI<>GY=U]FM+%8V(9 MY>\X"Y`:P=*NV$E;Y4!<S&J2_"5YMUK(6!;YC$G)G"H/Q4MRUSF,Q.QE[VJ! M:'"U3/)'95>41@90UI(UR6\%,\^CN#X2L$;YLR*XPAGUK,C`DD"7B/50%%\9 M[MBRNZ;$3[,D]KW-[Y'MR#8<I$N6/`_S94'QDFNN$LRNN^@,%`YQ[BJ*/F+) MP2][CD*E@*(%[AE3DZIQ58*V6DUIO%J9$OQYCO&7=)^Y`HIM:;!2>1)GD20D M438I!6(V"WJO%?5=E\J[SZ]C%+K6H(V@7XX6KH'3:KNT67`C22DJ;770+;YA M,")S`E\@M;#9HAL!=6E0J>\H"EWHIBM8/J=KY[BTI\)=32U!7E1(#YTZ0S-. MT"=RY)Y^>.>(&F;!;[9E7VJ,P\F,`O6-5[1`+;W!_M8OD2JHH((**JB@@@HJ JJ*"""BJHH((**JB@@@HJJ*"""BJHH((**JB@@@HJ^&;P/[=^;\8`4``` ` end Best regards Alexei

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