On Tue, 9 Jan 2001, David S. Miller wrote: > Ignore Ingo's comments about the MSG_NOCOPY flag, I've not included > those parts in the zerocopy patches as they are very controversial > and require some VM layer support. Okay, I talked to some kernel engineers where I work and they were (I think) very justifiably skeptical of zero-copy work with respect to read/write style APIs. > Basically, it pins the userspace pages, so if you write to them before > the data is fully sent and the networking buffer freed, they get > copied with a COW fault. Yum... Assuming a gigabit ethernet link is saturated with the sendmsg(MSG_NOCOPY) API, what is CPU utilization like for a given clock speed and processor make? It is any different than the sendfile() case? davez -- Dave Zarzycki http://thor.sbay.org/~dave/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/
- Re: [PLEASE-TESTME] Zerocopy ... Ingo Molnar
- Re: [PLEASE-TESTME] Zerocopy ... David S. Miller
- Re: [PLEASE-TESTME] Zerocopy ... Linus Torvalds
- Re: [PLEASE-TESTME] Zerocopy ... Stephen C. Tweedie
- Re: [PLEASE-TESTME] Zerocopy ... Stephen Frost
- Re: [PLEASE-TESTME] Zerocopy ... Ingo Molnar
- Re: [PLEASE-TESTME] Zerocopy ... Stephen Frost
- Re: [PLEASE-TESTME] Zerocopy ... Dave Zarzycki
- Re: [PLEASE-TESTME] Zerocopy ... Ingo Molnar
- Re: [PLEASE-TESTME] Zerocopy ... David S. Miller
- storage over IP (was Re: [PLE... Dave Zarzycki
- storage over IP (was Re: [PLEASE-TESTM... dean gaudet
- Re: storage over IP (was Re: [PLE... Alan Cox
- Re: storage over IP (was Re: [PLE... David S. Miller
- Re: storage over IP (was Re: ... dean gaudet
- Re: storage over IP (was Re: ... David S. Miller
- Re: [PLEASE-TESTME] Zerocopy networking patch, 2.4.0-1 Jes Sorensen
- Re: [PLEASE-TESTME] Zerocopy networking patch, 2.4... David S. Miller
- Re: [PLEASE-TESTME] Zerocopy networking patch,... Jes Sorensen
- Re: [PLEASE-TESTME] Zerocopy networking pa... Stephen Frost
- Re: [PLEASE-TESTME] Zerocopy networkin... David S. Miller