Date: Thu, 21 Jan 2016 18:02:18 -0800 From: Adrian Chadd <adrian.chadd@gmail.com> To: Benno Rice <benno@jeamland.net> Cc: Ryan Stone <rysto32@gmail.com>, "<freebsd-transport@freebsd.org>" <freebsd-transport@freebsd.org> Subject: Re: Flamegraph of 8KB message bottlenecks Message-ID: <CAJ-Vmo=vbqRmBrh%2Bk3o6M-D-u=Q1%2Bb_j2beO2kG5PNgQzMe%2BAQ@mail.gmail.com> In-Reply-To: <D856A593-F6CC-420D-9489-7C02A2567B76@jeamland.net> References: <CAFMmRNzBfNB7Fr3VYKJwHpxt1CBc4gT6Yh%2Bqx2u2O_K1KF3nxQ@mail.gmail.com> <CAJ-Vmo=CLt7xL04pTRui-qdsSeugsHqu3pCOYOKQT-mARPfEkg@mail.gmail.com> <CAFMmRNwwRmdEbBaL=pNzThHSA0skmhrsVH9sFkn-A2Txu=Q%2BnQ@mail.gmail.com> <CAJ-Vmokgtkx_Xjn6o9fbC3GyybBMNsX9Y9geLnznPMfxuHMTDA@mail.gmail.com> <D856A593-F6CC-420D-9489-7C02A2567B76@jeamland.net>
next in thread | previous in thread | raw e-mail | index | archive | help
On 21 January 2016 at 16:00, Benno Rice <benno@jeamland.net> wrote: > The idb stuff is an Isilon-internal thing. It=E2=80=99s a different stora= ge system for the file descriptor tables. Ok. So hm, looking at that, i'd look at the syscall count breakdown to see if you're doing very inefficient kqueue (eg add, trigger/remove, read/write, add, etc.) rather than keeping it in the kqueue list. But yeah, that fgets in the kqueue path and sleep lock contention in the send path is hurting. :( Maybe get a syscall breakdown, and maybe a lock profile trace? -a > >> On Jan 21, 2016, at 14:16, Adrian Chadd <adrian.chadd@gmail.com> wrote: >> >> A lot of that syscall time is in kevent, doing fget locking. What kind >> of filedescriptor is being used here? Just a normal socket, or is it >> kqueue on some /dev entry or something? >> >> What's that "idb_" stuff? >> >> >> -a >> _______________________________________________ >> freebsd-transport@freebsd.org mailing list >> https://lists.freebsd.org/mailman/listinfo/freebsd-transport >> To unsubscribe, send any mail to "freebsd-transport-unsubscribe@freebsd.= org" >
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?CAJ-Vmo=vbqRmBrh%2Bk3o6M-D-u=Q1%2Bb_j2beO2kG5PNgQzMe%2BAQ>