Date: Thu, 07 Oct 2010 14:35:31 +0200 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-stable@freebsd.org Subject: Re: zfs hang in zio->io_cv) with dd read Message-ID: <i8keq6$ar9$1@dough.gmane.org> In-Reply-To: <20101007121558.GA70199@zibbi.meraka.csir.co.za> References: <20101007121558.GA70199@zibbi.meraka.csir.co.za>
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On 10/07/10 14:15, John Hay wrote: > Hi, > > I got hold of a SunFire X4500 with 48 X 500G disks and thought to try > FreeBSD 8-stable with zfs on it. > > I have setup the two boot disks in a zfs mirror and then the rest in > a pool of 6 X raidz2 of 7 disks each. > > I have created a 10G file with dd in the second pool, but if I try to read > it with dd, dd will hang in "zio->io_cv)" according to ^T. This happens > everytime. The first time I saw messages about an interrupt storm, so I > have put "hw.intr_storm_threshold=10000" in /etc/sysctl.conf. According to > "systat -vm 1" there is atapci for 2-3 seconds and then it is quiet. There are two things you could try: 1) use the AHCI driver (ahci_load="YES" in /boot/loader.conf) and 2) disable superpages, they don't get along on a few models of Opterons (vm.pmap.pg_ps_enabled=0 in /boot/loader.conf).
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