Re: absurd I/O perf with ZFS: hangs on zfs->cv)

2013-01-18 Thread Adam Vande More
On Tue, Jan 15, 2013 at 10:57 PM, Eitan Adler wrote: > Hi all. > > > Running FreeBSD 9.1-Release, I am seeing some absurd hangs (10 minutes > or more to open a file) with SIGINFO informing me that the process is > stuck on zio->io_cv. > > Does anyone have any suggestions for what I want to look a

Re: absurd I/O perf with ZFS: hangs on zfs->cv)

2013-01-18 Thread Eitan Adler
On 18 January 2013 05:20, Fabian Keil wrote: > A common recommendation is to disable atime for all datasets where > it isn't needed as it can cause lots of unnecessary write operations. Good call. I thought I had already disabled atime updating but it turns out that some datasets had this proper

Re: absurd I/O perf with ZFS: hangs on zfs->cv)

2013-01-18 Thread Fabian Keil
Eitan Adler wrote: > On 17 January 2013 07:52, Fabian Keil wrote: > > Eitan Adler wrote: > > I don't think there are any laptops with "large amounts of RAM" > > as far as ZFS is concerned. > > Haha okay: 8GB of RAM. > > >> It is taking me 45 minutes to make 5 commits to git. Something is > >

Re: absurd I/O perf with ZFS: hangs on zfs->cv)

2013-01-17 Thread Eitan Adler
On 17 January 2013 07:52, Fabian Keil wrote: > Eitan Adler wrote: > I don't think there are any laptops with "large amounts of RAM" > as far as ZFS is concerned. Haha okay: 8GB of RAM. >> It is taking me 45 minutes to make 5 commits to git. Something is >> wrong here but I have no idea what I

Re: absurd I/O perf with ZFS: hangs on zfs->cv)

2013-01-17 Thread Fabian Keil
Eitan Adler wrote: > On 15 January 2013 23:57, Eitan Adler wrote: > > Running FreeBSD 9.1-Release, I am seeing some absurd hangs (10 minutes > > or more to open a file) with SIGINFO informing me that the process is > > stuck on zio->io_cv. > > > > Does anyone have any suggestions for what I wan

Re: absurd I/O perf with ZFS: hangs on zfs->cv)

2013-01-16 Thread Eitan Adler
On 15 January 2013 23:57, Eitan Adler wrote: > Hi all. > > > Running FreeBSD 9.1-Release, I am seeing some absurd hangs (10 minutes > or more to open a file) with SIGINFO informing me that the process is > stuck on zio->io_cv. > > Does anyone have any suggestions for what I want to look at to tune