Re: [9fans] zero copy & 9p (was Re: PDP11 (Was: Re: what heavy negativity!)
yes. bugs, on my side at least. The copy isolates from others. But some experiments in nix and in a thing I wrote for leanxcale show that some things can be much faster. It’s fun either way. > El 13 oct 2018, a las 23:11, hiro <23h...@gmail.com> escribió: > > and, did it improve anything noticeably? > >> On 10/13/18, Charles Forsyth wrote: >> I did several versions of one part of zero copy, inspired by several things >> in x-kernel, replacing Blocks by another structure throughout the network >> stacks and kernel, then made messages visible to user level. Nemo did >> another part, on his way to Clive >> >>> On Fri, 12 Oct 2018, 07:05 Ori Bernstein, wrote: >>> >>> On Thu, 11 Oct 2018 13:43:00 -0700, Lyndon Nerenberg >>> wrote: >>> Another case to ponder ... We're handling the incoming I/Q data stream, but need to fan that out to many downstream consumers. If we already read the data into a page, then flip it to the first consumer, is there a benefit to adding a reference counter to that read-only page and leaving the page live until the counter expires? Hiro clamours for benchmarks. I agree. Some basic searches I've done don't show anyone trying this out with P9 (and publishing their results). Anybody have hints/references to prior work? --lyndon >>> >>> I don't believe anyone has done the work yet. I'd be interested >>> to see what you come up with. >>> >>> >>> -- >>>Ori Bernstein >>> >>> >> >
Re: [9fans] zero copy & 9p (was Re: PDP11 (Was: Re: what heavy negativity!)
and, did it improve anything noticeably? On 10/13/18, Charles Forsyth wrote: > I did several versions of one part of zero copy, inspired by several things > in x-kernel, replacing Blocks by another structure throughout the network > stacks and kernel, then made messages visible to user level. Nemo did > another part, on his way to Clive > > On Fri, 12 Oct 2018, 07:05 Ori Bernstein, wrote: > >> On Thu, 11 Oct 2018 13:43:00 -0700, Lyndon Nerenberg >> wrote: >> >> > Another case to ponder ... We're handling the incoming I/Q data >> > stream, but need to fan that out to many downstream consumers. If >> > we already read the data into a page, then flip it to the first >> > consumer, is there a benefit to adding a reference counter to that >> > read-only page and leaving the page live until the counter expires? >> > >> > Hiro clamours for benchmarks. I agree. Some basic searches I've >> > done don't show anyone trying this out with P9 (and publishing >> > their results). Anybody have hints/references to prior work? >> > >> > --lyndon >> > >> >> I don't believe anyone has done the work yet. I'd be interested >> to see what you come up with. >> >> >> -- >> Ori Bernstein >> >> >
Re: [9fans] zero copy & 9p (was Re: PDP11 (Was: Re: what heavy negativity!)
I did several versions of one part of zero copy, inspired by several things in x-kernel, replacing Blocks by another structure throughout the network stacks and kernel, then made messages visible to user level. Nemo did another part, on his way to Clive On Fri, 12 Oct 2018, 07:05 Ori Bernstein, wrote: > On Thu, 11 Oct 2018 13:43:00 -0700, Lyndon Nerenberg > wrote: > > > Another case to ponder ... We're handling the incoming I/Q data > > stream, but need to fan that out to many downstream consumers. If > > we already read the data into a page, then flip it to the first > > consumer, is there a benefit to adding a reference counter to that > > read-only page and leaving the page live until the counter expires? > > > > Hiro clamours for benchmarks. I agree. Some basic searches I've > > done don't show anyone trying this out with P9 (and publishing > > their results). Anybody have hints/references to prior work? > > > > --lyndon > > > > I don't believe anyone has done the work yet. I'd be interested > to see what you come up with. > > > -- > Ori Bernstein > >
