Re: [9fans] Sources Gone?

> ownership doesn't mean anything at the venti level. it really > is just a virtual disk drive with lba80 content addressing. I think you mean lba160.

Re: [9fans] Pegasus 2.6 is released

> if you are providing > some extended (e.g.) math functionality to a program with a shared > library, people are going to be upset with you if you argue that it > can be done with RPC. > > I hope the reason is obvious :-) Not obvious to me. In today's (well, tomorrow's) massively multicore worl

Re: [9fans] Flash Video

2009/2/3 Eris Discordia : > I don't know of any open source implementations of Flash Player. The > software on each platform and for each browser seems to be (c) Adobe and > closed source. Does an open source implementation, however incomplete, > exist? Well, there is"gnash", which aims to be an o

Re: [9fans] Flash Video

-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On Feb 3, 2009, at 5:11 AM, Eris Discordia wrote: I don't know of any open source implementations of Flash Player. The software on each platform and for each browser seems to be (c) Adobe and closed source. Does an open source implementation, how

Re: [9fans] Sources Gone?

in the past i've pondered, in my crypto-naive way, if it might be possible to make venti (or at least vac) somewhat more secure by applying some kind of crypto to the data structures containing scores. to my mind, the biggest security vulnerability in venti is the ability to unconditionally enumer

Re: [9fans] Sources Gone?

> to my mind, the biggest security vulnerability in venti > is the ability to unconditionally enumerate an entire file tree given > its root score. if the VtPointer data structures, or the > scores within them, were encrypted somehow, maybe > that vulnerability could be mitigated. scores would stil

Re: [9fans] Flash Video

I don't know of any open source implementations of Flash Player. The software on each platform and for each browser seems to be (c) Adobe and closed source. Does an open source implementation, however incomplete, exist? Videos embedded in SWF files are encoded in Sorenson's MPEG-4 profile.

Re: [9fans] Pegasus 2.6 is released

On Tue, Feb 3, 2009 at 2:55 AM, Richard Miller <9f...@hamnavoe.com> wrote: > Not obvious to me. In today's (well, tomorrow's) massively multicore > world, I would expect a remote call to a process in another core, with > its own instruction cache, could easily be more efficient than a local > pro

Re: [9fans] Pegasus 2.6 is released

> > Not obvious to me. In today's (well, tomorrow's) massively multicore > > world, I would expect a remote call to a process in another core, with > > its own instruction cache, could easily be more efficient than a local > > procedure call. > > > > well, there's remote calls and remote calls. R

Re: [9fans] Sources Gone?

erik wrote: > i'm not sure i understand. either you have the key (score) > and you can decrypt the whole cyphertext (read the file tree > below), or you don't. assuming of course that scores are too > hard to guess. so the solution is: don't give out the root score. my read on the utility of ro

Re: [9fans] Sources Gone?

> my read on the utility of rog's proposal is that you could then > pre-exchange the crypto key via secure channel (real live handoff or > whatnot) and then send root scores around freely over things like > email. unauthorized parties reading your email then don't get your > venti data. if you wan

Re: [9fans] Sources Gone?

2009/2/3 erik quanstrom : >> to my mind, the biggest security vulnerability in venti >> is the ability to unconditionally enumerate an entire file tree given >> its root score. if the VtPointer data structures, or the >> scores within them, were encrypted somehow, maybe >> that vulnerability could

Re: [9fans] Pegasus 2.6 is released

Here's the best answer I can give, check this out: http://www.scipy.org/ But as for introducing parallelism to cover the latency, it's an old trick and works well. But do you want to be the one to tell people, "you're going to have to introduce parallelism and fingernail-pulling bugs because I wan

Re: [9fans] Sources Gone?

> >> I'm not sure how you'd fix this. What if only a portion of the block > >> belongs to me and the other happens to be the password file? > > > > venti just stores whole blocks. > > Yes, but the content isn't guaranteed to be from a single user. In > fact, venti has no clue. Change that and

Re: [9fans] Sources Gone?

> information can't leak in principle, but root scores are dangerous, which > is why open-access venti servers are problematic - if such a score > *does* happen to leak, then unconditional access to all your data has > also leaked. what prevents using a non-root score in a similar fashion? - erik

Re: [9fans] Sources Gone?

> venti really doesn't > care what you store. OK, enough agreement :-) The issue is that to provide any level of privacy to venti is impossible, it needs to be done at a higher layer. I think the original request was for sources to be replicated at the venti block level, something that could hav

Re: [9fans] Sources Gone?

> information can't leak in principle, but root scores are dangerous, which > is why open-access venti servers are problematic - if such a score > *does* happen to leak, then unconditional access to all your data has > also leaked. If I understand correctly, this line of discussion is primarily mo

Re: [9fans] Sources Gone?

> but as i said, i'm naive when it comes to crypto; maybe > there's no way of doing this with any decent degree > of security or usefulness. Encryption is always a two-way path: for every bit of piece of mind encryption provides, there is a corresponding fear of losing access. Also, encryption ten

Re: [9fans] Sources Gone?

> i'm not sure i understand. either you have the key (score) > and you can decrypt the whole cyphertext (read the file tree > below), or you don't. assuming of course that scores are too > hard to guess. so the solution is: don't give out the root score. fossil/last will find the most recent ro

Re: [9fans] Pegasus 2.6 is released

> One thing I've learned: some people will take a hit of a factor of > 1000 in performance to preserve their concept of what is easy to use. > Hence things like scipy. It works well for many people. thanks for the reference. this is an interesting problem. most of the time a 1000x hit is a great

Re: [9fans] Sources Gone?

> now getting rather jaded about the fact that my fresh fossil/venti > server has taken five days, twice, to dump -a little over 1GB of data > on two separate occasions, I'm not sure encryption is affordable. i would imagine that cpu has nothing to do with it and encryption would add no overhead a

[9fans] Fossil/venti performance (Was: Sources Gone?)

> i would imagine that cpu has nothing to do with it and encryption > would add no overhead at all. i would image that seeks dominate > your performance numbers. Well, there are numerous issues. The machine is a CPU server booting off another fossil/venti host; it has its own rather pristine, mo

Re: [9fans] Fossil/venti performance (Was: Sources Gone?)

> I can't easily check before fossil is active, but venti takes a long > time to start and by the time the machine is "ready", memory is full > and half of swap is in use :-( During "snap -a" load, context > switching and interrupts tend to swing wildly and swap is often being > accessed (it's on I

[9fans] p9p page freebsd

hi, page fails on freebsd. # page venti.pdf swapcontext failed: Invalid argument Assertion failed: (0), function contextswitch, file thread.c, line 300. 874: signal: sys: abort # gdb $PLAN9/bin/page page.core GNU gdb 6.1.1 [FreeBSD] Copyright 2004 Free Software Foundation, Inc. GDB is free softwa

Re: [9fans] Flash Video

the original question was about flash video. many here seem to have interesting ideas, but obviously not motivated enough to want to plan/research/read/understand. two clues: mpeg4 and rtp >> By the way, Gnash seems to be quite useful.

Re: [9fans] Flash Video

Very interesting. Thank you. By the way, Gnash seems to be quite useful. --On Tuesday, February 03, 2009 12:22 PM +0100 Christian Walther wrote: 2009/2/3 Eris Discordia : I don't know of any open source implementations of Flash Player. The software on each platform and for each browser see

Re: [9fans] Flash Video

On Tue, Feb 3, 2009 at 10:44 PM, Eris Discordia wrote: > Very interesting. Thank you. > > By the way, Gnash seems to be quite useful. Well, that depends on what you call useful...

Re: [9fans] Flash Video

2009/2/3 Skip Tavakkolian <9...@9netics.com>: > the original question was about flash video. > > many here seem to have interesting ideas, but obviously > not motivated enough to want to plan/research/read/understand. > > two clues: mpeg4 and rtp Thanks, I see there are some RFCs related to RTP, a

[9fans] devlpt optimization

I just solderd a paralel printer cable and together to get an old canon bjc250 to work, finding that printing on plan9 was horribly slow compared to ghostscript on linux :-(. The printer paused up to 5 seconds after each a row. It takes minutes to print the first page of /sys/doc/lp.ps... I compar