Date: Sun, 25 Nov 2007 22:50:45 +0200 From: "Pentarh Udi" <pentarh@gmail.com> To: freebsd-bugs@freebsd.org Subject: ata_alloc_request() failure?! Message-ID: <408514ed0711251250k33d1039fi416f91ee4099b841@mail.gmail.com>
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FreeBSD 6.2-RELEASE amd64
1. How it appears
I dont know why but it appeared when i configured geom_stripe on two
ata disks and made a heavy load.
So i get the tons of kernel messages:
ad4: FAILURE - out of memory in start
ad6: FAILURE - out of memory in start
ad6: FAILURE - out of memory in start
ad6: FAILURE - out of memory in start
I did some research and didnt found any answers on this problem, but i
found a source of this error:
==================
/sys/dev/ata/ata-disk.c: line 215
static void
ad_strategy(struct bio *bp)
{
device_t dev = bp->bio_disk->d_drv1;
struct ata_device *atadev = device_get_softc(dev);
struct ata_request *request;
if (!(request = ata_alloc_request())) {
device_printf(dev, "FAILURE - out of memory in start\n");
biofinish(bp, NULL, ENOMEM);
return;
}
==================
Also that is another point to see the problem:
# vmstat -z | egrep "LIMIT|ata"
ITEM SIZE LIMIT USED FREE REQUESTS FAILURES
ata_request: 336, 0, 0, 1298, 1769922, 4
As you can see there are ata_request failures.
I even tryed to increase kmem_size up to 1Gb instead of 400+M default.
There was no effect. When I make a heavy load on this disk, i get
failures and broken files.
I saw this error on other machine (also FreeBSD 6.2 RELEASE amd64)
with geom_mirrror configured (under heavy load) - but not so much -
one or two kernel messages during "life".
So... what should i do?
--
Regards, Pentarh Udi
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