Date: Tue, 26 Apr 2011 10:37:41 +0000 From: Alexander Best <arundel@freebsd.org> To: Steve Wills <swills@FreeBSD.org> Cc: current@FreeBSD.org Subject: Re: responsiveness during IO tasks Message-ID: <20110426103741.GA25031@freebsd.org> In-Reply-To: <4DB620CB.50302@FreeBSD.org> References: <4DB620CB.50302@FreeBSD.org>
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On Mon Apr 25 11, Steve Wills wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Hi, > > I've noticed lately that when doing heavy IO, my 9-CURRENT system (Fri > Apr 15 23:33:46 EDT 2011) is quite unresponsive. I have two ZFS mirrors > setup and run KDE4. The system has 12GB of RAM. > > When I, for example, copy an ISO image from one mirror to the other, the > whole desktop becomes really slow during the copy. It takes a good 15 > seconds to open a new tab in Konsole, switching windows takes a while, > etc. Once the copy is finished, things are fine. It wasn't like this > back before I upgraded from 8.2-RC1 to 9-CURRENT. Has anyone else > noticed something similar, or is it just me? Is there any other info I > can provide or something I should look for? i've noticed this too. for me the situation is sometimes even worse. during heavy i/o the mouse cursor won't even respond. i think this is a scheduler isse. maybe running a non-preemptive kernel or switching to the old 4bsd scheduler fixes it? cheers. alex > > Thanks, > Steve > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v2.0.17 (FreeBSD) > > iQEcBAEBAgAGBQJNtiDLAAoJEPXPYrMgexuh2hgIAK4a33NtKUNP5bDy9nCumjNM > Y+0WYxio72kDEUR0KPGJKB8TT3qV4DAknvydEvOTvXNQq2GZUX5WvJKu0cNwbg7g > qQt7xawaQq9NkE4dGJLMgDRDrkGVzHEFFHKegmFl8l9WnUxC8ffAjEvtW63Lcefe > xLzo9s3SbfmKS5p6dm/EXx49rSrtZv3uENnPBErXDY4Vd6LtNRBV2umk2GzU0Jgr > HdOcZVv+MOSEbIMavJidRtYE5Ous0XYRBYFF+ZHhRVkLQ4yIj2OXmQiB0IjYh11O > gX0NcHSBA8Pe6WbRRpcUbS0Evr4ur/n1VWgwZB/Bfbrtt0RnFbRDNCnBfOLAhuw= > =ZgkD > -----END PGP SIGNATURE----- -- a13x
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