Date: Sat, 27 Sep 2014 22:24:56 -0500 From: Bryan Venteicher <bryanv@daemoninthecloset.org> To: Steven Hartland <killing@multiplay.co.uk> Cc: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org> Subject: Re: Change uma_mtx to rwlock Message-ID: <CAMo0n6Sfqxh0vx8ZfwzHLqiwdvR7okrQ9ogK6PzvQ0aaq6iD6Q@mail.gmail.com> In-Reply-To: <0EAA931C1DCF4897A45D86C7CBDCA11C@multiplay.co.uk> References: <CAMo0n6Q=P5H3%2BCqr8KjFRVLvWHZfJYnROVe4xF3DmKw95D%2B5zQ@mail.gmail.com> <CF61374E89D8461093CEDB42D4FCBABE@multiplay.co.uk> <CAMo0n6QMogoNS-X0exL-LHc_pymRGDA1kn408KF59XgJ1qRQtw@mail.gmail.com> <0EAA931C1DCF4897A45D86C7CBDCA11C@multiplay.co.uk>
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On Sat, Sep 27, 2014 at 9:30 PM, Steven Hartland <killing@multiplay.co.uk> wrote: > ----- Original Message ----- From: "Bryan Venteicher" < > bryanv@daemoninthecloset.org> > >> On Sat, Sep 27, 2014 at 8:42 PM, Steven Hartland <killing@multiplay.co.uk >> > >> wrote: >> >> Out of interest does that include ZFS and its UMA zones, as we're >>> currently >>> investigating issues around this. >>> >>> >>> Yes, I believe this would include ZFS's zones too >> > > It would but I was more curious as it if you had seen the delay > specifically on > the ZFS zone or if it was other zones which triggered the issue for you? > > We are using an old version of FreeBSD/ZFS, so our ZFS allocations go through malloc instead of directly to UMA. For us, it was the cumulative effect of the number of UMA zones (buckets really) that lead to long hold times of the UMA mutex. ZFS related allocations were a significant part of that, but not typically the largest. > Regards > Steve >
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