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wow cohost is really bringing out the good posters
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Nov 16, 2022 17:22
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I’m saving up for an effort chost about my latest hyperfixation on a space sim
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Nov 16, 2022 17:32
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Silver Alicorn posted:I’m saving up for an effort chost about my latest hyperfixation on a space sim :just_chost:
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Nov 16, 2022 17:55
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I’m trying not to treat cohost like twitter idk
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Nov 16, 2022 18:00
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yeah same. not because i can't it's more the vibe (which is cool)
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Nov 16, 2022 18:10
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https://cohost.org/Cariad/post/320270-throwback-post-hi-v i reposted an old twitter thread today
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Nov 16, 2022 18:43
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actually, help share this around cohost as i'd love to see what sort of noise we get https://cohost.org/Cariad/post/322575-a-cohost-group-photo
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Nov 16, 2022 21:28
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that's the kind of thing that got someone to flood my little server. good luck 
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Nov 16, 2022 21:33
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i have server(s) for things
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Nov 16, 2022 21:34
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Zamujasa posted:that's the kind of thing that got someone to flood my little server. good luck yeah. if it happens, it happens. pixel fights are funny to see play out
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Nov 16, 2022 21:34
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i wouldn't have minded quite so much if they didn't constantly hammer my server so hard for a solid 3 hours that it basically prevented anything else from working. some people just love to kick over sandcastles, i guess
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Nov 16, 2022 21:37
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Lain Iwakura posted:actually, help share this around cohost as i'd love to see what sort of noise we get 500'd 
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Nov 17, 2022 09:52
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i spent too fuckin long on this https://cohost.org/hailthefish/post/330642-just-chost
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Nov 17, 2022 13:21
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jeebus bob posted:500'd yeah. it has a fatal bug that breaks it. i am going to revisit the idea
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Nov 17, 2022 17:27
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If anyone wants to dip their toes into CSS crimes, this is an awesome beginner's app: https://cohost.org/blep/post/323847-prechoster
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Nov 17, 2022 17:31
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also i reported my first real bug on cohost. it isn't anything more than annoying but i am glad i thought about some abuse technique before someone else did
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Nov 17, 2022 19:34
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you can bookmark tags now so you can have like little content-specific timelines. that's pretty neat
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Nov 18, 2022 03:14
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Video Nasty posted:If anyone wants to dip their toes into CSS crimes, this is an awesome beginner's app: making css crimes is my day job,
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Nov 18, 2022 03:15
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Ready for posting, friends https://cohost.org/ADINSX
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Nov 18, 2022 03:37
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hi. I post movie reviews and sometimes a list of pre-y2k VR movies https://cohost.org/holloway/
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Nov 18, 2022 04:14
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N.Z.'s Champion posted:hi. I post movie reviews and sometimes a list of pre-y2k VR movies movies about vr or movies you watch in vr?
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Nov 18, 2022 20:56
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I'm https://cohost.org/SwitchWitch. Probably gonna post about networking / IoT / emulation things.
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Nov 20, 2022 00:53
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Kazinsal posted:shameless plug, an updated and extended version of my effortpost about the history of x86 memory management is now an effort-chost: https://cohost.org/kazinsal/post/276766-the-magical-history Nice! Thanks for writing that up. Can you link me your VMX history post as well? As for virtual machine extensions, it really isn't that much different than regular virtual memory. Instead of virtualizing application memory, the hypervisor virtualizes physical memory through a second level address table (SLAT) or in an Intel(tm)-ism: EPT (Extended Page Table). You can think of it exactly like a PML4 describing an address space of what physical memory on the system looks like with very similar structures. The hypervisor can then use that to map guest physical addresses into host physical addresses in RAM just like a kernel does for virtual memory, which allows the hypervisor to treat guest VMs exactly like how a kernel treats threads switching address spaces as they swap contexts. The EPT has some nice extra features over regular page tables in that it can specify the caching mechanism (noncached, write-back, write-through, etc.) of the physical page as well as its memory protections. Normally you can imagine that physical memory has no protections because it's simply RAM owned by the kernel, but a hypervisor can establish its own memory protections on top of the guest kernel's page table memory protections and handle faults just like regular page faults. This lets hypervisors page physical memory of its guests out, or share the same physical memory between two guests to save RAM on the host (Copy-On-Write in OS terms). EPT is the basis of many modern security mechanisms, and Windows now runs a hypervisor on all machines by default in order to isolate certain ranges of memory away from the regular kernel into a separate sort-of mini-vm called the Secure Kernel which stores things like domain credentials and keeps them safe even against kernel-level attacks. SLAT/EPT can also do cool things that virtual memory can't do, like establish "execute only memory" which is physical memory that can only be executed and not read or written to (regular page tables can't do execute-only because marking a page as execute implies readability normally). This is employed in things like the PS5, which marks its kernel memory as execute-only to prevent kernel exploits from being able to leak the PS5's kernel code just by running in kernel mode, which significantly reduces an attacker's ability to work on hacking the system. Basically, the invention of this second addressing table paved the way for all the performance and security improvements to hypervisors that give us the near-native guest VM performance and memory isolation that we all experience today. This feature was likely the single most influential thing to bringing us into the Cloud Era (tm). EDIT: EPT being able to specify caching attributes in the page tables isn't unique to EPT, page tables can do that now with PAT. Geebs fucked around with this message at 15:30 on Nov 20, 2022 |
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Nov 20, 2022 15:16
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very cool, thanks
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Nov 20, 2022 17:40
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i forgot my password
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Nov 20, 2022 18:48
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use a password manager
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Nov 20, 2022 18:56
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Silver Alicorn posted:use a password manager
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Nov 20, 2022 19:14
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Silver Alicorn posted:use a password manager
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Nov 20, 2022 19:24
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Silver Alicorn posted:use a password manager I used to use a combination password manager dishwasher, but I haven't found a god replacement since I got divorced. (IRONIC SEXISM TAG)
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Nov 20, 2022 19:25
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https://cohost.org/cache long time lurker first time choster
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Nov 20, 2022 22:20
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CACHE MANIFEST posted:
 https://cohost.org/sadbeast
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Nov 20, 2022 23:22
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Silver Alicorn posted:use a password manager never
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Nov 20, 2022 23:43
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does everyone else get logged out roughly once every day or two or is it just me
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Nov 20, 2022 23:57
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haven’t gotten logged out on my pc. i just looked on my phone however and it was logged out.
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Nov 21, 2022 00:05
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Progressive JPEG posted:does everyone else get logged out roughly once every day or two or is it just me i do too
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Nov 21, 2022 00:09
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Progressive JPEG posted:does everyone else get logged out roughly once every day or two or is it just me 
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Nov 21, 2022 00:35
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it's a known thing
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Nov 21, 2022 00:36
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akadajet posted:movies about vr or movies you watch in vr? movies about vr and any movie where computers/cyberspace are treated like new technology that can do anything including magic (lawnmower man 2, computer wore tennis shoes (1995), mangler 2, etc)
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Nov 21, 2022 02:04
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i like cohost but my posting strategy of blasting bad jokes into the aether does not seem to fit it otoh my effortposts on old computers do
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Nov 21, 2022 02:15
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I effort post my photography and photos of the cats and it goes well. I'm having a great time chosting.
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Nov 21, 2022 04:48
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